Unit 3 Test Review

Find the rate of change.

• -2 minutes per gallon
• -20 minutes per gallon
• -2 gallons per minute
• -20 gallons per minute

At what rate did the rain fall?

• 2 cm per hour
• ¹/₄ cm per hour
• ¹/₂ cm per hour
• 4 cm per hour

What is the constant of variation in the equation  $4x-12y=0$  ?

•  $k=-\frac{1}{3}$  

•  $k=4$  

•  $k=\frac{1}{3}$  

•  $k=-12$  

 y varies directly with x, and y is 16 when x is 32. Which equation represents this situation?

• y=32x
• y=16x
• y=2x
• y=(1/2)x

In a direct variation, y=39 when x=3.  Find the value of y when x=2.

• 26
• 3
• 58.5
• 2

What is the slope in the equation:  y=4x+3

• 3
• 4x
• 4
• x

Identify the y-intercept in y = 3x + 5

• 0

• 3

• -2

• 5

Write the equation of the line.

• y= -1x-3
• y= -3x-1
• y=-1/3x-1
• y= -3x-3

Write the equation for the line in slope-intercept form.

• y= -1x+3
• y= 4x+3
• y=1/4x+3
• y= -4x+3

Which is the graph of y=-x+2?

• A
• B
• C
• D