The number of miles a car can drive varies directly with the number of gallons of gas in the car. If the car can go 81 miles on 3 gallons of gas, how many gallons does the car
need to go 378 miles?

none.

step-by-step explanation:

m

1

=

5

m1=5

b

=

−

1

b=-1

find the slope and y-intercept of the second equation.

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m

2

=

0

m2=0

b

=

−

6

b=-6

compare the slopes

m

m of the two equations.

m

1

=

5

,

m

2

=

0

m1=5,m2=0

compare the two slopes in the decimal form. if the slopes are equal, then the lines are parallel. if the slopes are not equal, then the lines are not parallel.

m

1

=

5

,

m

2

=

0

m1=5,m2=0

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.