Math Functions Review

Which two functions have a graph that is a line?

• y = 2x²– 9x

• y = –3^x

• y = 2x – 9

Select all of the following equations which define linear functions.

• y = x² – 7

• y = 6 – 5x

• y = 9x

Dave owns a lawn business. He charges $10 per hour and a $25 dollar disposal fee. What is the correct equation Dave would use to find out how much to charge his customers?

• y = 25x + 10

• x = 25y + 10

• y = 10x +25

• x = 10y + 25

What's the initial value of the equation y = 2x + 4

• 4

• -4

• 2

• 2x

What is the rate of change and initial value?

• Rate of Change = 3 Initial Value = 8

• Rate of Change = 8 Initial Value = 3

• Function
• Not a Function

The graph shows a proportional relationship between time and number of boxes a machine packages.  How many boxes does the machine package in 4 minutes?

• 180 boxes

• 240 boxes

• 120 boxes

• 300 boxes

The distance a jet aircraft flies has a proportional relationship with its number of hours in flight. Find the unit rate.

• 410 miles per hour

• 820 miles per hour

Which is an example of an ordered pair?

• y = mx

• (7, 1)

• 9, 2

• V = lwh

Solve the proportion.

• 9

• 4.5

• 216

• 12