Direct Variation Review

For a direct variation function, the ____________ of the variables is constant.

The dependent variable is the _________________________.

Find the slope of the line.

A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. What is the equation of variation?

• y = 123x

• y = 20x

• y = 6.15x

• y = 0.16x

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the constant of variation?

• k = 13

• k = 65

• k = 5

• k = 1/13

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the equation of variation?

• y = 13x

• y = 65x

• y = 5x

• y = 1/13x

What is the slope?

• $2/1 mile drive

• $1/2 miles driven

• 2 miles driven/$1 

• 1 mile driven/$2

Which statement matches the graph?

• Taylor can write 6 words per minute

• Taylor can write 25 words per minute

• Taylor can write 50 words per minute

• Taylor can write 150 words per minute

Is the relationship shown on the graph directly proportional?

• Yes

• No

What is the constant of proportionality?