a
x 0.5x + 10 y
0 0.5(0) +10 = 10 (0,10) the y intercept
1 0.5(1) + 10 = 10.5 (1, 10.5)
4 0.5(4) + 10 = 12 (4, 12)
5 0.5(5) + 10 = 12.5 (5, 12.5)
6 0.5(6) + 10 = 13 (6, 13)
b
see attached graph
c
Since they add ten for each call before they multiple miles it is not proportional.
d.
No because the graph shows negative numbers and presumably the company can't charge you if they don't drive there.
