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  • 18-09-2017
  • Mathematics
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9 + b = -12
q+ (-9) = 12

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DeathTheKid101 DeathTheKid101
  • 18-09-2017
Subtract 9 from both sides

b = -12 - 9

simplify -12 - 9 

Answer: b = -21

9 + -21 = -12 is true.

simplify brackets

simplify q + -9 to q - 9

add 9 to both sides

simplify 12 + 9 to 21

q = 21

21 + -9 = 12 is true.
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