Check it out! 1.5.1: Rearranging Formulas 1. Read the scenario below. Write an equation and use it to answer the questions that follow. In January 2011,

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Presentation transcript:

Check it out! 1.5.1: Rearranging Formulas 1

Read the scenario below. Write an equation and use it to answer the questions that follow. In January 2011, the national average for 5 gallons of gasoline was $ What was the national average for 1 gallon of gas? 2.What was the price for 18 gallons of gas? 2

1.What was the national average for 1 gallon of gas? Set up the equation. Let x represent the cost per gallon of gasoline. 5x = Using inverse operations, solve this equation for x. 5x = 17.20Original equation Divide each side by 5. x = 3.44 Interpret the solution. The average cost of 1 gallon of gasoline was $ : Rearranging Formulas

2.What was the price for 18 gallons of gas? To find the cost of 18 gallons of gasoline, multiply the number of gallons by the cost per gallon = $61.92 Interpret the solution. The cost of 18 gallons of gasoline at $3.44 a gallon is $ : Rearranging Formulas