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# Download Chapter 3 – Solving Linear Equations

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Chapter 3 – Solving Linear Equations 3.7 – Formulas and Functions 3.7 – Formulas and Functions Today we will learn how to: Solve a formula for one of its variables Rewrite an equation in function form 3.7 – Formulas and Functions So far, we have been working with equations that have one variable. Today, we are going to work with equations that have more than one variable. 3.7 – Formulas and Functions Formula – an algebraic equation that relates two or more real-life quantities 3.7 – Formulas and Functions Example 1 Solve A = lw for w. Find the width of a rectangle that has an area of 42 ft.2 and a length of 6 ft. 3.7 – Formulas and Functions Example 2 5 Solve K F 32 273 for F. 9 3.7 – Formulas and Functions Example 3 Solve I = Prt for t. Find the number of years t that $2800 was invested to earn $504 at 4.5% 3.7 – Formulas and Functions When you have an equation with x and y, you can re-write the equation two ways. “y is a function of x” means you rearrange the equation so you have y = “x is a function of y” means you rearrange the equation so you have x = 3.7 – Formulas and Functions Example 4 Rewrite the equation 2x – y = 9 so that y is a function of x. 3.7 – Formulas and Functions Example 5 Write the equation 2x – y = 9 so that x is a function of y. Use the result to find x when y = -2, -1, 0, and 1. 3.7 – Formulas and Functions HOMEWORK Page 177 #11 – 14, 16 – 34 even