Respuesta :

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Answer:

y = -2

x = 4

Explanation:

  • 9x + 4y = 28
  • 2x + 4y = 0

Make "x" subject in equation 2

  • 2x + 4y = 0
  • 2x = -4y
  • x = -2y

Insert this in equation 1

  • 9(-2y) + 4y = 28
  • -18y + 4y = 28
  • -14y = 28
  • y = -2

Find for x

  • x = -2y
  • x = -2(-2)
  • x = 4