Question

The points (2,5) , (3,3) and (k,1) all lie on a straight line

(a) find the value of k
(b) find the equation of the line

Answer 1

(a) k = 4
(b) y = - 2x + 9

Explanation:

x2-x1, y2-y1
= 3-2, 3-5

= 1,-2
3,3 + 1,-2 = (4,1)

x=4