3.7 Formulas Goal: To solve for a given variable in a formula.

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3.7 Formulas Goal: To solve for a given variable in a formula

? Most Common Formulas A =  • r2 d = r • t P = 2l + 2w E = mc2 F =ma Area is 56.2 km2 ? A =  • r2 d = r • t P = 2l + 2w E = mc2 F =ma

Why would you want to solve for a formula? Solving for a variable in your formula can give you more specific information Solving for a variable in your formula can help you to manipulate an object Example: F=MA

How to Solve Formulas… Our goal is to undo everything that is being done to the variable that we are trying to solve for by doing the opposite operation.

Literal Equations Solve a formula for the unknown variable d = r • t t

Literal Equations Solve for “h” 2• • 2 r

A formula for the average “k” of three numbers is: Solve for “c”. 3k = a + b + c - a - b - a - b 3k – a - b = c

Solve for “r”: C = 2  r

Solve for “m”: E = m c2

You Try: Solve for l: P=2l +35

You Try: Solve for t: v = 3k t

Last one….. Solve for h A = bh 2

Assignment: Page 142 #’s 1-20 all, 26-34 (even)

Solve: