Question

Points: (10, 70), (25, 100)
Write the equation of the linear function shown on the graph.
A. y = 2x - 25
B. y = 2x + 50
C. y = 1/2x - 25
D. y = 1/2x + 50

Answer 1

Slope m = (100 − 70)/(25 − 10) = 30/15 = 2.
Use y = 2x + b with (10,70): 70 = 20 + b → b = 50.
So the equation is y = 2x + 50, choice B.