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  • 25-07-2017
  • Mathematics
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find the solution of -x+5y=-18 5x-9y=10

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choixongdong
choixongdong choixongdong
  • 25-07-2017
-x + 5y= -18 so x = 5y + 18
5x-9y=10
substitute x = 5y + 18 into 5x - 9y = 10

5x - 9y = 10
5(5y + 18) - 9y = 10
25y + 90 - 9y = 10
16y = - 80
 y = -5

x = 5y + 18
x = 5(-5) + 18
x = -25 + 18
x = -7

answer
(-7, -5)


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