SOLUTION: 2x+2y=4 4x+2y=-8 How will be this equation will solved by matrix inverdion method

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Question 1012562: 2x+2y=4
4x+2y=-8
How will be this equation will solved by matrix
inverdion method
Answer by addingup(3677) About Me  (Show Source):
You can put this solution on YOUR website!
2x+2y=4 Let's subtract this from the next.
4x+2y=8
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4x+2y = 8
-+2x+2y = 4
2x----= 4
x = 2
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Now find y:
2x+2y= 4
2(2)+2y= 4
4+2y= 4
2y= 0
y= 0
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Check:
2x+2y= 4
2(2)+2(0)= 4
4+0= 4 this is correct. Let's try the next one:
------------------------------
4x+2y = 8
4(2)+2(0) = 8
8+0 = 8 this is also correct. We have the right answer:
x = 2
y = 0