Which equation represent a liner function with a slip of 1/2 and a y-intercept of -15

Question

Choices

1) y=-15x+1/2

2) y=x/2-15

3) y=-x/2+15

4)y=2x-15

Answer 1

y = mx + b

m = 1/2

b = -15

y = (1/2)x - 15