SOLUTION: X-2y=0 2x+ 5y=9 Solve the matrix

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Question 956807: X-2y=0
2x+ 5y=9
Solve the matrix
Found 2 solutions by Fombitz, Alan3354:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Ax=b
A=%28matrix%282%2C2%2C1%2C-2%2C2%2C5%29%29
x=%28matrix%282%2C1%2Cx%2Cy%29%29
b=%28matrix%282%2C1%2C0%2C9%29%29
.
.
.
x=A%5E%28-1%29b
.
.
abs%28A%29=1%285%29-2%28-2%29=5%2B4=9
A%5E%28-1%29=%281%2F9%29%2A%28matrix%282%2C2%2C5%2C2%2C-2%2C1%29%29
So then,
x=%281%2F9%29%2A%28matrix%282%2C2%2C5%2C2%2C-2%2C1%29%29%2A%28matrix%282%2C1%2C0%2C9%29%29
x=%28matrix%282%2C1%2C2%2C1%29%29

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
X-2y=0
2x+ 5y=9
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Multiply the 1st eqn by 2, then subtract.