Solve the system using substitutions:

x has a value of 1. Use this value to find the value of y.

y has a value of 1.
x=1
y=1
Only thing i could think of to answer this is a scatter-plot. hope this helps..
Answer:
Independent: g
Dependent: c
The cost of the gas depends on the amount he pumps
The slope is m=9 for the points.