sarahlamar382 sarahlamar382

03-12-2014
Mathematics

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3x+4y=2 4x-4y=12 elimination

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Wenqian Wenqian

03-12-2014

3x+4y=2
+ 4x-4y=12 add them since 4y and -4y can cancel out
7x=14 divide each side by 7
x=2

3x+4y=2 x=2
3(2)+4y=2 substitute
6+4y=2
-6 -6
4y=-4 divide each side by 4
y=-1

Answer Link

03-12-2014

3x+4y=2
4x-4y=12
Add both
7x=14
X=2
Substitute value of x in first equation
Y=-1

Answer Link

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