Question

The staright line L passes through the points A(-1,4) and B(5,8).
a. Calculate the gradient of L
b. Find the equation of L
c. The Line L also passes through the point P(8,y). Find the value of y.

Answer 1

the gradient is, of course, (8-4)/(5+1) = 2/3
so the equation is
y-4 = 2/3 (x+1)
Now plug in the point and solve
y-4 = 2/3 (8+1)