find the solution of -x+5y=-18 5x-9y=10

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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 · Answer 1 · 2017-07-25T22:03:29+02:00

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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