if a line has a slope of 4 with the points (-8,a) and (-10,-2) what is the value of a

Question

Its finding a missing coordinate using slope for algebra 1

Answer 1

Mae, how do we find slope? Change in y over change in x, right?

 

(a - (-2))/(-8 - (-10)) = 4

(a + 2)/(-8 + 10) = 4

(a + 2)/2 = 4

 

Since the left side is divided by 2, we do the opposite and multiply both sides by 2

 

a + 2 = 8

a = 6

 

Boom.