Objective The learner will solve problems using formulas

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Objective The learner will solve problems using formulas The learner will solve formulas for one variable in terms of another

Lesson 2-6 Formulas Pages 111 - 115

A literal equation is an equation involving two or more variables. Formulas are special types of literal equations. To transform a literal equation, you solve for one variable in terms of the others. This means that you get the variable you are solving for alone on one side of the equation.

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Solve the formula for the area of a triangle A = ½ bh for height h.

Now you try: Solve the formula for the perimeter of a rectangle P = 2(l + w) for the width w.

Now you try: Solve y – 4 = 3x – 8 for x.

Sometimes an equation will only have variables Sometimes an equation will only have variables. Transforming this type of equation is no different from the previous examples.

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Now you try: You can use the number of chirps n a cricket makes in one minute to estimate the outside temperature F in degrees Fahrenheit. Transform the formula F = n/4 + 37 to find the number of chirps in terms of temperature. How many chirps per minute can you expect if the temperature is 60 degrees Fahrenheit?