Page 604 - Basic College Mathematics with Early Integers

Vocabulary and Readiness Check

Use the choices below to fill in each blank.

equation multiplication simplifying
solving equivalent expression

-3x 51
1. The equations -3x = 51 and = are called equations.
-3 -3
2. The difference between an equation and an expression is that a(n) contains an equal sign, while
a(n) does not.
3. The process of writing -3x + x as 2x is called the expression.
4. For the equation -5x =-20 , the process of finding that 4 is the solution is called the equation.
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5. By the property of equality, y = 8 and 3 y = 3 8 are equivalent equations.

8.3 Exercise Set FOR EXTRA HELP

Objective Solve. See Examples 1 through 5.

1. 5x = 20 2. 6y = 48 3. -3z = 12 4. -2x = 26 5. 0.4y =-12 6. 0.8x =-8

2 3
7. 2z =-34 8. 7y =-21 9. -0.3x =-15 10. -0.4z =-16 11. 10 = x 12. 27 = x
5 7

1 1 5 5 4 8 2 4 3 9
13. y =-5 14. y =-3 15. x = 16. y = 17. - z = 18. - v =
6 8 6 18 7 21 9 27 4 14

Solve. First combine any like terms on each side of the equation. See Examples 6 through 8.

19. 2w - 12w = 40 20. -8y + y = 35 21. 16 = 10t - 8t 22. 100 = 15y - 5y

23. 2z = 1.2 + 1.4 24. 3x = 1.1 + 0.7 25. 4 - 10 =-3z 26. 12 - 20 =-4x

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