1. Goal: Rewrite common formulas and equations that have more than one variable.

5.  A. A formula for the circumference of a circle is C = ∏ d. Solve for d.  B. A formula for distance is d = rt. Solve for r.

6.  A plumber needs to replace a pipe but cannot measure the diameter of the pipe directly. Instead, the plumber measures the circumference. It is 3 1/8 inches. What is the diameter of the pipe, to the nearest 1/8 inch?

8.  Find the value of y in the equation 2x + 3y = 9 when x = -6 and when x = 9.

9.  Find the value of y in the equation 2y + x = 5x + 6 when x = -3 and when x = 6.

10.  Yearbook: Ads in your school’s yearbook sell for $150 per half page and $250 per full page. Write an equation with more than one variable to represent the total revenue from the sale of the ads.

11.  Yearbook: The yearbook staff needs to raise an additional $3500 through the sale of ads before printing the yearbook. What are some combinations of full-page ads and half-page ads that will meet this objective?

12.  Refer to Example 5. Suppose the goal was to sell $6000 worth of ads. What is one combination of full-page and half-page ads that meets this objective?

14. Section 1-4: p. 29-31 22-30 even, 72-84 even Section 1-5: p. 36-39 12-17, 46-60 even