3 years ago

7x+6y=21 X+3y=-12 what is the answer

1 answer:

7 0

7x + 6y = 21 ⇒ 7x + 6y = 21
1x + 3y = -12 ⇒ 2x + 6y = -24
5x = 45
5 5
x = 9
  x + 3y = -12
  9 + 3y = -12
  - 9   - 9
3y = -21
3   3
y = -7
      (x, y) = (9, -7)

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