How do you use elimination in 4x-3y=8 and 5x-2y=-11

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15-12-2015
Mathematics

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How do you use elimination in 4x-3y=8 and 5x-2y=-11

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Panoyin Panoyin · Answer 1 · 2015-12-16T02:27:11+01:00

4x - 3y =   8 ⇒   8x - 6y = 16
5x - 2y = -11 ⇒ 15x - 6y = -33
   -7x = 49
      -7    -7
      x = -7
         4x - 3y = 8
         4(-7) - 3y = 8
         -28 - 3y = 8
   + 28 + 28
   -3y = 36
      -3   -3
      y = -12
      (x, y) = (-7, -12)

To use elimination you have to multiply the first graph by 2 and the second graph by 3 so that the two y-axis can be equal to -6. Then you do the rest to find the answer of the x-axis and the y-axis.