Name _____________________________________________________________________________________________________
Variables and Expressions
H 1-10
Evaluate each expression for x 15, y 6, and z 3.
1. 2x z
2. y 3z
3. 4x 5y
4. 6y 3z
5. 2x 2y 2z
6. 8 (y z)
7. 3y (x z)
8. x 2y z
9. At swim practice yesterday, Sam swam 4 more laps than David. If Sam swam x
number of laps, the expression x 4 describes the number of laps David swam.
Sam swam 27 laps yesterday. How many laps did David swim?
10. After swim practice, the team went out for pizza. The cost of a pizza is $9.
The cost of buying x number of pizzas is 9x. The cost of garlic bread is $3 a loaf.
The cost of y loaves of garlic bread is 3y. Use the expression 9x 3y to find the
cost of 4 pizzas and 7 loaves of garlic bread.
11. Mental Math Evaluate the expression 79x 81y 9z for x 2, y 1, and z 0.
12. Janet has $12.75, and she wants to buy a game for $15.95. How much more money
does she need? If the game goes on sale for $2.00 less, will she have enough money?
Test Prep Circle the correct letter for each answer.
13. If x 2y 15 and y 6, then x A 6
B
3
© Scott Foresman, Gr. 6
(29)
14. If 10x 2y and x 2, then y C 4
F
5
D 27
G 2
H 20
J
10
Use with Chapter 1, Lesson 10.