Proportions and Graphs

What is the Constant of Proportionality?

• k=46

• k=92

• k=0.2

• not proportional

Which of the following is the correct formula for finding the constant of proportionality?

• k = x/y

• k = y/x

• y = k/x

• x = k/y

The constant of proportionality is also the unit rate.

• True

• False

Identify the constant of proportionality.

• k = 2x

• k = 2

• k = 4

• none (not proportional)

Does this graph represent a proportional relationship?  

• No, because it doesn't pass through the origin.

• Yes, because it doesn't pass through the origin.

• Yes, because it intersects the y axis.

• No, because it intersects the x axis.

In the ordered pair (4,9), which number is the y-coordinate?

• 4

• 9

• neither

• both

What makes a graph proportional?

• Linear

• The line is only in quadrant 1

• Curvy line

• Linear and the line goes through the origin

Craig earns extra money as a lifeguard. He earns $37 for 4 hours and $64.75 for 7 hours.  What is the constant of proportionality (how much did he make per hour)?

• $37

• $64.75

• $9.25

• $18.50

Based on the graph, Which of the following statements is TRUE?

• I drove 80 miles every 4 hours

• I drove 160 miles in an hour

• I drove 80 miles every 2 hours

• I drove 240 miles in 4 hours

Write the equation for the table.

• y = x + 4

• y = 5x

• y = 4x + 1

• y = x + 5