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3.6 Literal Equations and Formulas

3.6 Literal Equations and Formulas. Literal “letter” equations: an equation that uses more than one letter as a variable. D=rt A=bh C= d I=prt You can solve the equation for any of the variables. Practice. For D=rt solve for r D = rt t t D = r t. Practice.

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3.6 Literal Equations and Formulas

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  1. 3.6 Literal Equations and Formulas • Literal “letter” equations: an equation that uses more than one letter as a variable. • D=rt • A=bh • C= d • I=prt You can solve the equation for any of the variables.

  2. Practice • For D=rt solve for r • D = rt t t • D = rt

  3. Practice • For P=2b + 2h, solve for h • P = 2b + 2h-2b -2bP - 2b = 2h • P - 2b = 2h 2 2 • P – 2b = h 2

  4. Practice • For I = prt solve for p (Interest = principle ∙ rate ∙ time) • I = prtrt rt • I = prt

  5. How long will it take me to make $50 interest on $350 at 10% interest? Remember to use I=prt I = prtpr pr I = tpr 50____ = t350 (.10) 50 = t35 ~1.43 years = t Try these

  6. Try these • x = 4y – 16 6 • 6x = 4y – 16+16 +16 • 6x + 16 = 4y 4 4 • 6x + 16 = y 4 • Solve for y • x = 4y – 16 6

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