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ratio of change in output to input values. Here the horizontal or input values stand for x and the vertical or output stands for y.

Here in (2, 2) input value is 2 and output value is 2

In (-5, -19) input value is -5 and output value is -19

gasoline.

Number of miles he drove is 200

Horizontal change is 200 miles.

Change in amount of gasoline = 4 – 8 = -4

If the travelling distance is increasing then the amount of gasoline decreases. Hence the rate of change shows a negative sign.

Hence Edward’s car is burning 0.02 gallons of gasoline per mile. If the travelling distance is increasing then the amount of gasoline

decreases.