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09-04-2015
Mathematics

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solve each system by substitution -7x+2y=18, 6x+6y=0

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smartpersonlisten1 smartpersonlisten1

09-04-2015

2y= 7x+18
6x+ 3(7x+18)=0
6x+21x+54=0
27x=-54
x=-2

6(-2)+6y=0
6y=12
y=2

6(-2)+6(2)=0
-12+12=0 True

-7(-2)+2(2)=18
14+4=18 True

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