Question

Write the equation of the line containing the points (-1,3) and (2,4) in y=mx+b form.
Help!

Answer 1

First find the slope

Answer 2

Any ideas on how to do that?

Answer 3

rise/run. aka: Y2-Y1/X2-X1

Answer 4

\[\frac{ 4-3 }{2+1}\]

Answer 5

Yes, the slope formula. m= y2-y1 over x2-x1

Answer 6

good, so the slope is ???

Answer 7

find the slope with that then chose one set of coordinates to replace the x- and y- values.

Answer 8

1/3 ?

Answer 9

yes, good

Answer 10

so m = 1/3

now plug in any of the two points, so if you pick the first point, then you plug in x = -1 and y = 3 into y = mx+b to get

y = mx+b

y = 1/3x + b

3 = (1/3)(-1) + b

Keep going to solve for b

Answer 11

Thank you guys!! That was helpful @a0zzy and @jim_thompson5910

Answer 12

no problem

Answer 13

you're welcome