emtodd610 emtodd610

26-10-2017
Mathematics

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3x-5y=7, x=2y+4 solve by system of equation

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choixongdong choixongdong

26-10-2017

3x-5y=7, x=2y+4

substitute x=2y+4 into 3x-5y=7

3x-5y=7
3(2y+4)-5y=7
6y + 12 - 5y = 7
y = -5

x=2y+4
x = 2(-5) + 4
x = -10 + 4
x = -6

answer
x = -6 and y = -5

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