Solving a Direct Variation Application: Calories Burned on a Treadmill
Problem: When Raoul runs on the treadmill at the gym, the number of calories, , he burns varies directly with the number of minutes, , he uses the treadmill. He burned calories when he used the treadmill for minutes.
(a) Write the equation that relates and .
Step 1. Write the formula for direct variation. We will use in place of and in place of .
Step 2. Substitute the given values for the variables.
Step 3. Solve for the constant of variation.
Step 4. Write the equation that relates and . Substitute in the constant of variation.
(b) How many calories would he burn if he ran on the treadmill for minutes?
Find when . Write the equation that relates and . Substitute the given value for . Simplify.
Raoul would burn calories if he used the treadmill for minutes.
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