pmullin pmullin

06-05-2015
Mathematics

Answered

how do I solve this system using substitution: y = x - 7 ; 2x + y = 8

Answer :

Panoyin Panoyin

06-05-2015

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)

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anshupatel199 anshupatel199

06-05-2015

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

Answer Link

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