Applying Linear Functions

The distance that an automobile travels varies directly as the time it travels. If the car travels 280 miles in 7 hours, how far will it travel in 12 hours?

• 480

• 1960

• 84

• 25

The graphs of linear functions f(x) and g(x) are shown on the grid. Which function is best represented by the graph of g(x) ?

If y varies directly as x and y = 18 when x = 3, Find y when x = 7.

• 16

• 34

• 42

• 49

Slopes of parallel lines are...

• opposite reciprocals

• the same

• opposites

• always 7

The diagram shows a linear function of g. What is the value of k.

• 5

• 4

• 7

• 8

A holiday meal costs $12.50 a person plus a delivery fee of $30.

• 30 + 12.5x 

• 12.5 + 30

• 12.5 + 30x

Slopes of perpendicular lines are...

• opposite reciprocals

• the same

• opposite

• always 7

Write an equation of a line that passes through the point (-9,2) and is perpendicular to the line y = 3x - 12

• y = (-1/3)x - 1

• y = (1/3)x - 2

• y = -3x + 12

• y = 3x - 1

Write an equation in slope intercept form that is parallel to y = 2x + 3 and passes through the point (3, -4).

• y = 2x + 10

• y = 2x -10

• y = -2x -10

• y= -2x - 2

Are these lines perpendicular?
y = (1/2)x + 2
y = -2x + 13

• YES

• NO