A. Tell whether the given value is a solution of the given equation or not.
1. x + 8 = 13; x = 5
2. m + 12 = -6; m= 28
3. x - 12 = 42; x = 54
4. -4 - n = 13; n = 6
5. a + ½ = ¼; a = ¾
B. Solve each equation using mental mathematics.
11. x + 2 = 5
12. x - 3 = 9
13. x + 14 = 8
14. x - 5 = 2
15. x 2x + 7 = 3
1. x + 8 = 13; x = 5
2. m + 12 = -6; m= 28
3. x - 12 = 42; x = 54
4. -4 - n = 13; n = 6
5. a + ½ = ¼; a = ¾
B. Solve each equation using mental mathematics.
11. x + 2 = 5
12. x - 3 = 9
13. x + 14 = 8
14. x - 5 = 2
15. x 2x + 7 = 3
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