Answer:
b
Step-by-step explanation:
because it passes the vertical line test and A does not if you look at x = 1 there are 2 points along that point (1,3) (1,-1)
3 and 4
y=5x
y=5(0)
y=0
y=5(10)
y=50
y=5(51)
y=255
y=5(400)
y=2000
