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Rewriting Equations and Formulas 1.4

Rewriting Equations and Formulas 1.4. That is rewriting equations and formulas with more than one variable. Solve for y. 7x – 3y = 8 y = 7 / 3 x - 8 / 3. Given the equation 2x + 5y = 4, find y when x = -3, -1, 2, and 6.

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Rewriting Equations and Formulas 1.4

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  1. Rewriting Equations and Formulas 1.4 That is rewriting equations and formulas with more than one variable.

  2. Solve for y 7x – 3y = 8 y = 7/3x -8/3

  3. Given the equation 2x + 5y = 4, find y when x = -3, -1, 2, and 6. Right side of room: substitute -3 into the equation and solve for y. Repeat this process for the other values of x. Left side of room: Solve the equation for y. Then evaluate the resulting expression for y using each of the given values of x. 2, 6/5,0,-8/5

  4. Given the equation x + xy = 1, find y when x = -1 and 3. Right side of room: Solve the equation for y. Then evaluate the resulting expression for y using each of the given values of x. Left side of room: substitute -1 into the equation and solve for y. Repeat this process for the other values of x. (-1,-2),(3,-2/3)

  5. You are organizing a benefit concert. You plan on having only two types of tickets: adult and child. Write an equation with more than one variable that represents the revenue from the concert. How many variables are in your equation? Total revenue = A ticket$ • #A + C ticket$ • #C R = p1A + p2C

  6. For the benefit concert, your goal is to sell $25,000 in tickets. You plan to charge $25.25 per adult and expect to sell 800 adult tickets. You need to determine what to charge for child tickets. How much should you charge per child if you expect to sell 200 child tickets? 300 child tickets? 400 child tickets? (200, 24),(300,16),(400,12)

  7. Common Formulas Check common formulas table on page 28. Mark this page for future reference in your book.

  8. Rewriting a Common Formula Solve A = ½bh for h.

  9. Assignment p. 29, 13-31 odd, 30, 32-34

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