21. Which equation expresses y in terms of x? A y=17x
B y=25x
C x=51y
D x=85y

22. What is the charge for renting a machine for 3.5 hours?
A $51.50
B $59.50
C $65.50
D $86.50

A, B

Step-by-step explanation:

21.

If you divide y by x (for example 51 by 3)for all of them you would get 17

Making the equation y=17x

22.

Since x = hours you plug in 3.5 for x

in the attachment.   i didn't see your choices.   the word which means there is choices.

step-by-step explanation:

(x,y)

x tells you how much left or right you go from the origin

y tells you how much down or up you go from the origin

so for example (-3,2), you go left 3 and up twice. i denoted which of the ordered pairs is which in my graph.