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How do I solve this system using substitution: y = x - 7 ; 2x + y = 8
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Feb 2, 2016
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How do I solve this system using substitution: y = x - 7 ; 2x + y = 8
Mathematics
high-school
KushalSeth
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y=x-7
2x+y=8
2x+x-7=8
3x=15
x=15/3
x=5
y=x-7
y=5-7
y=-2
x=5
y=-2
Ashwin Valento
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Feb 3, 2016
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Ashwin Valento
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y = x - 7
2x + y = 8
2x + (x - 7) = 8
2x + x - 7 = 8
3x - 7 = 8
+ 7 + 7
3x
=
15
3 3
x = 5
y = x - 7
y = 5 - 7
y = -2
(x, y) = (5, -2)
AceMark
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Feb 6, 2016
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AceMark
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