1. 1.4 Rewrite Formulas & Equations
Algebra II

2. On page 26 in your book, you need to be familiar with the Common Formulas Chart on this page!

3. Ex. 1 Solve the formula d=rt for t.
Then find the time it takes to travel 312 miles at an average rate of 48 miles per hour.

4. Ex 2: Solve the area of a trapezoid formula for b1.
A = ½ (b1+b2) h
2A = (b1+b2) h

5. Example 3 Rewriting a linear equation
A.) Solve 11x-9y= -4 for y.
-11x x
-9y=-11x-4
B.) Solve 7x-3y=8 for x.
+3y +3y
7x=3y+8

6. Ex. 4 Solve 2xy – 5y =8 for y. Then find the value of y when x =3.

7. Ex. 5
A campus bookstore sells T-shirts for $15 each & sweatshirts for $22 each. Write an equation for the bookstore’s revenue $ from selling m T-shirts & n sweatshirts.
Solve the equation for m.

8. Ex. 5 (Continued)
In order for the bookstore to have $6660 in revenue from sales of these two items during the fall semester, how many T-shirts must be sold if 150 sweatshirts are sold?

9. Assignment

10. Example 3: R = p1B + p2V Price of baseball cap # of caps sold
You are selling 2 types of hats: baseball hats & visors. Write an equation that represents total revenue.
Price of baseball cap
# of caps sold
# of visors sold
Total Revenue
Price of visor
R = p1B + p2V

11. Ex. 4 Dry ice is solid CO2. It does not melt, but changes into a gas at oF. What is this temperature in oC?