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Rewriting Formulas

Rewriting Formulas. Formula: An equation with more than 1 different variable. Solve for a variable: Get that letter (variable) alone. . Solving for a variable. Eliminate terms (add or subtract to each side) Eliminate coefficient (÷ or mult . by recip.)

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Rewriting Formulas

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  1. Rewriting Formulas • Formula: An equation with more than 1 different variable. • Solve for a variable: Get that letter (variable) alone.

  2. Solving for a variable • Eliminate terms (add or subtract to each side) • Eliminate coefficient (÷ or mult. by recip.) • If a letter is in a ( ), get the ( ) alone first, then remove ( ) and continue • If there is more than 1 of desired letter in 2 terms, get the 2 terms together on same side and eliminate the rest, then reverse distribute (factor) and ÷ to get rid of ( ).

  3. Examples • 1. C= 2πr solve for r. What is r if C = 44 in.? • 2. P = 2l + 2w solve for w. What is w if l=12m and P= 41m.

  4. More practice • 3. A = ½ bh Solve for h. • 4. 9x – 4y = 7 Solve for y. What is y if x is -5?

  5. More practice continued • 2y = 6 – xy Solve for y. What is y if x= -3?

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