Question

The graph shows the rate at which paint is used to paint a wall.Enter values to complete each statement below based on the graph.

When 1 gallon of paint has been used, ( # ) square feet of the wall will be painted.

The unit rate is ( # )square feet per gallon.

Answer 1

400 is the answer to both parts.

Explanation:

Assuming the lower left corner is the origin, then the x axis increases by 100, and the y axis increases by 1/4.

If it only takes 1/4 gallon to paint 100 square feet, then we can do that four times with one gallon. With one gallon, we can paint 400 square feet.

This also gives us the answer to the second part. The unit rate is 400 square feet per gallon.

Answer 2

400 in both ( # )

Explanation:

A better plot is shown in the figure attached.

When 1 gallon of paint has been used, 400 square feet of the wall will be painted. This is known because point (1, 400) is on the line.

From the above statement, the unit rate is 400 square feet per gallon.