Respuesta :

smmwaite
Answer

y = 2x 

Explanation
The first thing is to find the gradient of the line.

Gradient = Δy/Δx
               = (4--2)/(2--1)
               = 6/3
                = 2


Now a general point (x, y) and one of thegiven points.

(y - 4)/(x - 2) = 2
y - 4 = 2(x  - 2)
y = 2x - 4 + 4
y = 2x + 0

y = 2x