kit0058 kit0058

02-03-2017
Mathematics

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solve by elimination

solve by elimination class=

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roseberline roseberline

02-03-2017

2x - 2y = -4
-3x -3y = 0
_____________________
-1x - 5y = -4

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H1a2r3s4h5 H1a2r3s4h5

02-03-2017

2x-2y=-4
Multiply eq.by 3
6x-6y=-12
-3x-3y=0
Multiply eq.by 2
-6x-6y=0
from both new eq.
6x-6y=-12
-6x-6y=0
So adding both eq. We get
-12y=-12
So y=1
From eq.1
2x-2y=-4
2x-2(1)=-4
2x-2=-4
2x=-4+2
2x=-2
x=-1
so x=-1 and y=1

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