i dont know how to find slope

pay attention to this review and write everything down the you will prob. get bro

how can i graph lines without having the y intercept on the graph?

You can graph any line from its equation by finding and graphing any 2 points that satisfy the equation. Alternatively, if you know the slope and any point on the line you can graph the point and use the slope to find more points on the line. You can find more details in the lessons at this link: https://www.khanacademy.org/math/algebra/two-var-linear-equations

This has no use in the real world.

Slope? It can be used later to calculate really important things.

I still don't know how to graph, this is so hard... :(

y=mx+b y=y m=any number x=x b=any number b is the y intercept, which is when x is zero what y is. Did this help? Or do you not understand how to graph from a slope intercept form?

If the slope of a line, for example is 2/1, I understand that the slope is 2. But what do I do if the slope is something like 3/4 or 5/8?

It is quite common for slopes to be fractions. A slope of 3/4 tells you that the line goes up 3 units as it moves right 4 units. Similarly, a slope of 5/8 tells you that the line goes up 5 units as it moves 8 units to the right. Hope this helps.

Here is the problem A line having a slope of 3/4 passes through the point (-8,4). Write the equation of this line as y=mx+b This is what i have y=3/4x + b 4=-96/4 +b

Yup, you've got everything correct. Now what's left is for you to solve for b and afterwards replace the b in your y = 3/4x + b. I hope this helped!

how do I find the y intercept of the line with the equation 4x-5y+15=0? I'm so lost!

The y-intercept is the point on the y-axis where the line crosses the y-axis. This means the x-coordinate for that point =0. Thus, you can always find the y-intercept by setting x=0 in the equation and solving for "y". 4(0) - 5y + 15 = 0 -5y + 15 = 0 15 = 5y 3 = y Your y-intercept is at: (0, 3) Hope this helps..

Main content

Algebra 1

Unit 5: Lesson 3

Writing slope-intercept equations

Slope-intercept form review

Google Classroom

Review slope-intercept form and how to use it to solve problems.

What is slope-intercept form?

Slope-intercept is a specific form of linear equations in two variables:

y, equals, start color #ed5fa6, m, end color #ed5fa6, x, plus, start color #1fab54, b, end color #1fab54

When an equation is written in this form, start color #ed5fa6, m, end color #ed5fa6 gives the slope of the line and start color #1fab54, b, end color #1fab54 gives its y-intercept.

Want to learn more about slope-intercept form? Check out this video.

Finding slope-intercept equation from features or graph

Example 1: Equation from slope and intercept

Suppose we want to find the equation of the line whose slope is start color #ed5fa6, minus, 1, end color #ed5fa6 and y-intercept is left parenthesis, 0, comma, start color #1fab54, 5, end color #1fab54, right parenthesis. Well, we simply plug start color #ed5fa6, m, equals, minus, 1, end color #ed5fa6 and start color #1fab54, b, equals, 5, end color #1fab54 into slope-intercept form!

y, equals, start color #ed5fa6, minus, 1, end color #ed5fa6, x, start color #1fab54, plus, 5, end color #1fab54

Example 2: Equation from two points

Suppose we want to find the line that passes through the points left parenthesis, 0, comma, minus, 4, right parenthesis and left parenthesis, 3, comma, minus, 1, right parenthesis. First, we notice that left parenthesis, 0, comma, start color #1fab54, minus, 4, end color #1fab54, right parenthesis is the y-intercept. Second, we use the two points to find the slope:

$\begin{aligned} \text{Slope}&=\dfrac{-1-(-4)}{3-0} \\\\\ &=\dfrac{3}{3} \\\\ &=\maroonC 1 \end{aligned}$

Now we can write the equation in slope-intercept:

y, equals, start color #ed5fa6, 1, end color #ed5fa6, x, start color #1fab54, minus, 4, end color #1fab54

Problem 1

Write the equation of the line whose slope is 5 and y-intercept is left parenthesis, 0, comma, minus, 7, right parenthesis.

y, equals

Want to try more problems like this? Check out these exercises:

Slope-intercept equation from graph
Slope-intercept equation from two points

Finding features and graph from slope-intercept equation

When we have a linear equation in slope-intercept form, we can quickly find the slope and y-intercept of the corresponding line. This also allows us to graph it.

Consider, for example, the equation y, equals, start color #ed5fa6, 2, end color #ed5fa6, x, start color #1fab54, plus, 3, end color #1fab54. We can quickly tell that the corresponding line has a slope of start color #ed5fa6, 2, end color #ed5fa6 and its y-intercept is left parenthesis, 0, comma, start color #1fab54, 3, end color #1fab54, right parenthesis. Now we can graph the line:

Problem 1

What is the slope of the line y, equals, 3, x, minus, 1?

What is the y-intercept of the line?

left parenthesis, 0, comma

right parenthesis

Want to try more problems like this? Check out these exercises:

Slope from slope-intercept equation
Graph from slope-intercept equation

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Julian733
Posted 2 years ago. Direct link to Julian733's post “i dont know how to find s...”
i dont know how to find slope
(2 votes)
Answer
- Jaiden Galecki
  Posted 2 months ago. Direct link to Jaiden Galecki's post “pay attention to this rev...”
  pay attention to this review and write everything down the you will prob. get bro
  (3 votes)
Martin Calkins
Posted 5 years ago. Direct link to Martin Calkins's post “how can i graph lines wit...”
how can i graph lines without having the y intercept on the graph?
(2 votes)
Answer
- Kim Seidel
  Posted 5 years ago. Direct link to Kim Seidel's post “You can graph any line fr...”
  You can graph any line from its equation by finding and graphing any 2 points that satisfy the equation.
  
  Alternatively, if you know the slope and any point on the line you can graph the point and use the slope to find more points on the line.
  
  You can find more details in the lessons at this link: https://www.khanacademy.org/math/algebra/two-var-linear-equations
  (4 votes)
eaco5460
Posted 2 years ago. Direct link to eaco5460's post “This has no use in the re...”
This has no use in the real world.
(2 votes)
Answer
- T̷h̷e̷C̷o̷d̷i̷n̷g̷L̷e̷g̷e̷n̷d̷ INACTIVE
  Posted 2 years ago. Direct link to T̷h̷e̷C̷o̷d̷i̷n̷g̷L̷e̷g̷e̷n̷d̷ INACTIVE's post “Slope? It can be used lat...”
  Slope? It can be used later to calculate really important things.
  (4 votes)
jcontrerasalejo0747
Posted 2 years ago. Direct link to jcontrerasalejo0747's post “how do you find the slope”
how do you find the slope
(3 votes)
Answer
- Hannah Alisse
  Posted 2 years ago. Direct link to Hannah Alisse's post “Here's my explanation :) ...”
  Here's my explanation :)
  The slope of the line is another way of saying How steep is this line?
  To find an exact number for that, we use the concept rise over run.
  First, you find two points on the line, (Let's say our points are (3,3) and (4,5))
  Next you find out how much the line runs, aka how much it goes sideways within the two points we picked. To do that, you take the point with the greatest x value, and subtract the x value of the other point:
  4-3=1
  Now let's find the rise aka how much the line goes up within the two points we picked. To do that, we take the y value of our first point, and subtract the y value of our second point:
  5-3=2
  Now we have our Rise (2) and our Run (1), so let's put Rise over Run:
  2/1
  simplify
  2
  And we have the slope of the line!
  (1 vote)
Louis Kwan
Posted 6 years ago. Direct link to Louis Kwan's post “I still don't know how to...”
I still don't know how to graph, this is so hard... :(
(2 votes)
Answer
- Victor Dang
  Posted 6 years ago. Direct link to Victor Dang's post “y=mx+b y=y m=any number ...”
  y=mx+b
  
  y=y
  m=any number
  x=x
  b=any number
  b is the y intercept, which is when x is zero what y is.
  Did this help? Or do you not understand how to graph from a slope intercept form?
  (4 votes)
Chassitypope
Posted 5 years ago. Direct link to Chassitypope's post “how do you figure out how...”
how do you figure out how to point it
(2 votes)
Answer
- Kim Seidel
  Posted 5 years ago. Direct link to Kim Seidel's post “Please clarify your quest...”
  Please clarify your question... what do you mean by "how to point it"?
  (0 votes)
jess mcdermott
Posted 5 years ago. Direct link to jess mcdermott's post “how do I find the y inter...”
how do I find the y intercept of the line with the equation 4x-5y+15=0? I'm so lost!
(0 votes)
Answer
- Kim Seidel
  Posted 5 years ago. Direct link to Kim Seidel's post “The y-intercept is the po...”
  The y-intercept is the point on the y-axis where the line crosses the y-axis. This means the x-coordinate for that point =0. Thus, you can always find the y-intercept by setting x=0 in the equation and solving for "y".
  4(0) - 5y + 15 = 0
  -5y + 15 = 0
  15 = 5y
  3 = y
  Your y-intercept is at: (0, 3)
  Hope this helps..
  (4 votes)
derrick lowery
Posted 4 years ago. Direct link to derrick lowery's post “why is this so hard? :(”
why is this so hard? :(
(2 votes)
Answer
- Beaniebopbunyip
  Posted 4 years ago. Direct link to Beaniebopbunyip's post “It’s okay. I really strug...”
  It’s okay. I really struggled with this at first. Just rewatch videos, do a lot of practice problems, etc. and you’ll get the hang of it!
  (0 votes)
Tony Yost
Posted 5 years ago. Direct link to Tony Yost's post “If the slope of a line, f...”
If the slope of a line, for example is 2/1, I understand that the slope is 2. But what do I do if the slope is something like 3/4 or 5/8?
(1 vote)
Answer
- Kim Seidel
  Posted 5 years ago. Direct link to Kim Seidel's post “It is quite common for sl...”
  It is quite common for slopes to be fractions.
  A slope of 3/4 tells you that the line goes up 3 units as it moves right 4 units.
  Similarly, a slope of 5/8 tells you that the line goes up 5 units as it moves 8 units to the right.
  
  Hope this helps.
  (2 votes)
Jessica Lynn Knowles
Posted 3 years ago. Direct link to Jessica Lynn Knowles's post “Here is the problem A lin...”
Here is the problem A line having a slope of 3/4 passes through the point (-8,4). Write the equation of this line as y=mx+b
This is what i have y=3/4x + b
4=-96/4 +b
(1 vote)
Answer
- Victor
  Posted 3 years ago. Direct link to Victor's post “Yup, you've got everythin...”
  Yup, you've got everything correct. Now what's left is for you to solve for b and afterwards replace the b in your y = 3/4x + b. I hope this helped!
  (2 votes)