Question

Someone please help me i can’t understand this at all

Answer 1

Part a:

m = (1 - 2)/(4 - 1) = -1/3

2 = (-1/3)(1) + b

2 = -1/3 + b

b = 7/3

f(x) = (-1/3)x + (7/3)

Part b:

f(5) = (-1/3)(5) + (7/3) = -5/3 + 7/3 = 2/3