Question

Solve the simultaneous equations 3x+y=172 x+y=12​

Answer 1

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Answer:

  (x, y) = (80, -68)

Step-by-step explanation:

Subtract the second equation from the first.

  (3x +y) -(x +y) = (172) -(12)

  2x = 160 . . . . . . . . . simplify

  x = 80 . . . . . . . . . divide by 2

  y = 12 -x = 12 -80 = -68 . . . . . find y from the second equation

The solution is (x, y) = (80, -68).