Posted by **Lilly** on Thursday, May 7, 2009 at 5:01pm.

write an equation in slope-intercept formfor the line passing thru each pair of points.

(12,5) and (-4,1)

pleae help me!!!! i don't understanf how to solve it

- math -
**Reiny**, Thursday, May 7, 2009 at 6:30pm
first find the slope

slope =(5-1)/(12+4) = 4/16 = 1/4

so y = (1/4)x + b

but (-4,1) lies on it

so 1 = (1/4)(-4) + b

1 = -1+b

b = 2

equation: y = (1/4)x + 2

I usually check if the other point satisfies,

LS = 5

RS + (1/4)(12 + 2

= 3+2 = 5 = LS

my equation is correct

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