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# Finding slope and intercepts from tables

Given a linear relationship in a table, practice finding the slope and intercepts.

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• I didn't understand the Linear equations word problems:tables. What he explains in the video doesn't seem to apply there at all.
• Roshni, I agree. There seems to be a missing lesson here for point-slope form. Please fix, Khan genies!
• I didn’t understand the problem with linear equations word table..... I need help with that
• OK, lets see if I can help you out. The problem in this video involves calculating slope. So, in this case, let´s say the tire rotation is the x value, and the distance to the tree is the y value. Slope is y over x , which means, rise over run. So, lets pick up an interval and calculate the slope. from 4 to 8 tire rotations, the x variation was, evidently, 4 units, and the y variation was -10 units.Lets apply y/x, which gives us -2.5 . That means the slope is -2.5 on all the line that the table represents.
Once the slope is known, it is easy to calculate the answers to the questions, because for every rotation of the tire, you know how many units it travels. I will not publish the answers to all the questions in the problems, because it would spoill the fun of solving them.

Hope this helps, and do not hesitate to ask more questions if you still do not get it.
• these problems are so easy but the actual problems are hard and make no sense
• i know, it is so annoying. I can do this in my head but the test is hard!
As previous mentions, the video(s) does not cover the practice for 'Linear equations word problems: tables'.
The formula in the 'Hint' is provided but no video-explanation of it, which makes it tricky to understand.
• then, once she's rotated one more time she crashed into the tree
• Lol, that's what I was thinking hahaha
• I never know if I can add a decimal and if I should round
• It will be mentioned in the question. As a rule of thumb in this lesson:Do not round unless mentioned
• Why couldn't we just use the slope-intercept form instead of the point-slope formula? What does a point-slope formula even mean/do?
• Point-slope is just another way to write linear functions. Point-slope form is y-y1=m(x-x1) where you find the slope of the line, and you can pick any point (x1,y1) that lies on the line and plug it into the formula, and that’s all you do for point-slope. Hope that answers your question.
• Hi I have a question regarding one of the practice problems. I dont think the whole problem is needed here.

First you have this thing :

y-y1=m(x-x1)

Than it transforms into :

a) Temperature-2.5=7.5(Time-1)

Than it just says "when we solve for time we get.."

b) Time=Temperature+5/7.5

Can someone explain please how do you get time alone ? how do you exactly move things around to get from a) to b) ?

I spent a lot of time on this one but still dont get it. Thank you.