A few days ago
vivaldis_apprentice

# How can I find the slope and y intercept of a line, without graghing, when all I am given is two points?

Like, if I’m given (-7, 10) and (-3,2), how would I use that information alone to solve for the y intercept and the slope?

A few days ago
mathvideosonline.com

the slope m=(y2-y1)/(x2-x1)

m=2-10/-3-(-7)= – 8/4 = – 2

y=mx+b (m is the slope, b is the y-intercept)

If you replace y with 2 and x with -3, you will get:

2=-2(-3)+b

2=6+b

b=-4

So slope=-2, y-intercept=- 4

For a similar problem explained in a video, click here and play the first video:

http://www.math-videos-online.com/free-math-homework-help.html

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A few days ago
weissert21
Change in y / Change in x = slope

Then using y=m(x) + b plug in slope for m and one point (x,y), solve for b. In this case

m = -2

b = -4

you can then use the other point to check your answer by pluging in only the x and solving for y

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A few days ago
TypeA
y2-y1 over x2-x1 will give you the slope

2-10

___

-3-(-7)

-8

___

4

Slope is -2.

y= -2x

For the y-intercept I don’t know… You can draw it on paper and include those points without a calculator.

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A few days ago
Serenity
Well, I can’t give you the answer since this is for homework, but remember: y=mx+b.

Just kidding. That is all I remember from algebra. hah. Good luck. 🙂

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A few days ago
loufedalis
What Brittany said.
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A few days ago
brittttt
my brain hurts :/
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