I need help!

Which of the following has a graph that is a straight line?

a. y^2 = x - 1
b. y = 2x^2 + 4
c. y = 2x + 7
d. y = 3x^3

I need help Which of the following has a graph that is a straight line a y2 x 1 b y 2x2 4 c y 2x 7 d y 3x3 class=