Q: 2x-7y=30 what is x

I don't know if it's actually possible to find the value of x in this equation without knowing what y is, but it might be helpful to start by getting x by itself 2x - 7y = 30 add 7y to both sides 2x = 30 + 7y divide both sides by 2 x = (30 + 7y)/2 but wait, what if we replace x with (30+7y)/2, because they're equal We'd get 2((30+7y)/2)-7y=30 30+7y-7y=30 30=30... wait never-mind. That's technically correct, but also entirely useless. I still don't know what x is. If anyone knows if it's possible to find x with only this information, then let me know.

Q: 8c = 6b-3v c=5 b=13 v=16 True or False?

Replace each variable with its given value. Then complete the math on each side of the equation. It the 2 sides are equal, then it is True. If the 2 sides are not equal, then it is False.

Question 1

ok so umm we have to find the inequalities by know what's less than and greater than right?

Accepted Answer

Yes, does this mean you get the two confused?  If you make the sign with your left hand (<), left is less.  If you make the sign with your right hand (>), Tony the Tiger says right is Grrrrrrrrreater.

Question 2

The questions were easy, but didn't really make me think. And if i do get those my teacher should only assign like 3

Accepted Answer

Most of the questions were easy however my teacher loves to assign few but very tricky questions.

Question 3

How do you know if a word problem wants us to have the circle opened or closed? Are there key words, or certain things we have to look for?

Accepted Answer

if the problem is a <> with the line under which means equal too, as well. You close the circle since you include the number.

Question 4

I dont understand some of the questions

Accepted Answer

some of them are to trick you reread them

Question 5

I don´t understand some of the questions

Accepted Answer

Some are meant to trick you just reread the problem.

Question 6

i dont understand why circles need to be full or hollow

Accepted Answer

Full circle means we *include* the number:
X ≥ 3  This means X can be 3 *OR* greater

Hollow circle means we do *NOT* include the number:
X > 3 This means X can *ONLY* be greater than 3

Question 7

what is this usefull for my life? exept for not loosing maths but WHY

Accepted Answer

We never know. Don't waste your time with those questions. You do not study to pass the maths. You study to make your brain stronger and faster. When the future problem comes, you will be able to decide if inequalities will be needed or not and will solve then.

Question 8

Whats a good way to memorize which way the line on the number line goes? I keep forgetting.

Accepted Answer

If the variable is on the left, the inequality tells you which way to draw the line. For example:
x<6
Notice the inequality is pointing to the left, so your line goes to the left.

x>6
Notice the inequality points to the right, the line goes to the right.

Alternatively, you need to know that the smaller numbers are on the left of the number line and the larger numbers are to the right. A common tip used to help students remember what each inequality symbol means it to think of the symbol as the mouth of a hungry alligator. Its open mouth will always face the larger value.
6>x
Notice, the alligator wants to eat the 6 so it is larger than x. So, x must be numbers smaller than 6 and your line would get drawn to the left.

6<x
Notice, the alligator wants to eat the X, so the x is larger than 6 and your line needs to be to the right of the 6.

Hope this helps.

Question 9

2x-7y=30 what is x

Accepted Answer

I don't know if it's actually possible to find the value of x in this equation without knowing what y is, but it might be helpful to start by getting x by itself

2x - 7y = 30 add 7y to both sides
2x = 30 + 7y divide both sides by 2
x = (30 + 7y)/2

but wait, what if we replace x with (30+7y)/2, because they're equal

We'd get
2((30+7y)/2)-7y=30
30+7y-7y=30
30=30...

wait never-mind. That's technically correct, but also entirely useless. I still don't know what x is.

If anyone knows if it's possible to find x with only this information, then let me know.

Question 10

8c = 6b-3v

c=5
b=13
v=16

True or False?

Accepted Answer

Replace each variable with its given value.  Then complete the math on each side of the equation.  It the 2 sides are equal, then it is True.  If the 2 sides are not equal, then it is False.

Symbol	Meaning
$>$ ‍	Greater than
$\underset{―}{>}$ ‍	Greater than or equal to
$<$ ‍	Less than
$\underset{―}{<}$ ‍	Less than or equal to

MAP Recommended Practice

Course: MAP Recommended Practice > Unit 17

Graphing inequalities review

Inequalities

Inequalities symbols

Graphing inequalities with variables

Practice

Want to join the conversation?