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1) x + 7 = ( -3 ) + 7 = 4 ; x = -3
2) y − 9 = (-5) − 9 = -14 ; y = -5
3) 2m + n = 2(-6) + 6 = -12 + 6 = -6 ; m = -6 and n = 6
4) 6xyz = 6 (1) -1 (0) = 0 ; x = 1, y = -1, z = 0
5) 5x³ − 8y² = 5(2)³ − 8(-2)² = 5 ( 8 ) − 8 ( 4 ) = 40 − 32 = 8 ; x = 2 and y = -2
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Answers & Comments
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1) x + 7 = ( -3 ) + 7 = 4 ; x = -3
2) y − 9 = (-5) − 9 = -14 ; y = -5
3) 2m + n = 2(-6) + 6 = -12 + 6 = -6 ; m = -6 and n = 6
4) 6xyz = 6 (1) -1 (0) = 0 ; x = 1, y = -1, z = 0
5) 5x³ − 8y² = 5(2)³ − 8(-2)² = 5 ( 8 ) − 8 ( 4 ) = 40 − 32 = 8 ; x = 2 and y = -2
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