Set up a ratio of known to unknown:
Let X = the amount of gas needed for 500 miles:
220/12 = 500/x
Cross multiply:
220x = 6000
Divide both sides by 220:
X = 6000 / 220
x = 27.27 gallons (round answer as needed).
y = -2x + 3....slope = -2, y int = 3
2x + 4y = 8
4y = -2x + 8
y = -1/2x + 2....slope is -1/2, y int is 2
this is graph C
