smartdee88 smartdee88
  • 13-05-2021
  • Mathematics
contestada

7x+9y=-41 and x+3y=1. Solve system of equations

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sqdancefan
sqdancefan sqdancefan
  • 13-05-2021

9514 1404 393

Answer:

  (x, y) = (-11, 4)

Step-by-step explanation:

You can subtract 3 times the second equation from the first to eliminate y.

  (7x +9y) -3(x +3y) = (-41) -3(1)

  4x = -44

  x = -11

Substituting into the second equation gives ...

  -11 +3y = 1

  3y = 12

  y = 4

The solution is (x, y) = (-11, 4).

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