Seudónimo Seudónimo
  • 12-12-2016
  • Mathematics
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Twice the sum of a number and 9 equals 7.
Use the variable y for the unknown number.

Respuesta :

bcalle
bcalle bcalle
  • 12-12-2016
2(y + 9) = 7 Since it says twice the SUM, you have to do the addition first so the 2 times goes outside the parenthesis.

2y + 18 = 7 Subtract 18 from both sides
2y = -11 Divide both sides by 2
y = -11/2
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