Question

Find an equation for the line below.

Answer 1

f(x) = -5/3x + 5/3

Explanation:

if x = 4 ; f(x) = -5

if x = -2 ; f(x) = 5

f(x) = ax + b

-5 = 4a + b (1)

and

5 = -2a + b (2)

(1) + (2)

2a + 2b = 0

a = -b

(1) -5 = 4a - a

-5 = 3a

a = -5/3

Answer :

f(x) = -5/3x + 5/3