granyagami granyagami
  • 23-03-2018
  • Mathematics
contestada

linear equation 8x-3y=21, 4x+5y=-9

linear equation 8x3y21 4x5y9 class=

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sqdancefan
sqdancefan sqdancefan
  • 29-03-2018
Subtract the first equation from twice the second.
  2(4x +5y) -(8x -3y) = 2(-9) -(21)
  8x +10y -8x +3y = -18 -21
  13y = -39
  y = -3
Then we can find x by substitution into the first equation.
  8x -3(-3) = 21
  8x = 12 . . . . . . . subtract 9
  x = 12/8 = 3/2

The solution is (x, y) = (3/2, -3)
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