How do you solve $2x+9y=-2$ , $x+2y+3z=0$ , and $-y+z=1$ using matrices?

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Answer 1 · 2017-01-27T22:31:20

I found:
$x=17$
$y=-4$
$z=-3$

I used a matrix method normally called Cramer´s Method:
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To find $z$ we can simply use the third equation with the value of $y$ found in step 2:
$-(-4)+z=1$
$z=-3$

Hope it helps!

How do you solve 2x+9y=-22x+9y=-2, x+2y+3z=0x+2y+3z=0, and -y+z=1-y+z=1 using matrices?