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22-08-2017
Mathematics

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solve the system using substitution 5y-x=-5 7y-x=-23

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sss333111 sss333111

22-08-2017

5y-x= -5 7y-x= -23

x=5y+5

7y-(5y+5)= -23

7y-5y-5= -23

2y= -23+5

2y= -18

y= -9

x= 5y+5

x= (5*-9)+5

x= -45+5

x= -40

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