1. ALGEBRA I - SECTION 2-5 (Literal Equations and Formulas)@
SECTION 2-5 : LITERAL EQUATIONS and FORMULAS

2. 1) You are ordering pizzas and sandwiches. You have
a budget of $80. How many
sandwiches can you buy if
you buy 4 pizzas? 5 pizzas?
$5 each
ANSWERS : 8, 6
$10 each
LITERAL EQUATION : An equation that involves two or more variables.

3. Solve each equation for y
Solve each equation for y. Then, find the value of y for each value of x.
2) y – 2x = 5; x = 3, -4
ANSWERS : y = 2x + 5; 11, -3
3) 3x – 2y = 10; x = 10, -6
ANSWERS : y = (3/2)x – 5; 10, -14

4. Solve each equation for x.
ANSWER : x = (a – b)/c
ANSWER : x = (4c – 4b)/3

5. FORMULA : An equation that states a relationship among quantities.
See page 110 of your textbook.
6) What is the length of a rectangle with area 98 square feet and base 14 feet?
ANSWER : 7 feet

6. Derek’s yard is shaped like
7) Reygan walks 3 miles per hour (mph) and covers 12 miles. How many hours did she walk?
ANSWER : 4 hours
Derek’s yard is shaped like
a triangle whose “height” is 800 feet and whose area is 100,000 square feet. How long is the base of Derek’s yard in feet?
ANSWER : 250 feet