please see the file attachedfor the question

thanks

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- Dec 4th 2006, 06:44 AMgracyplease need help matrix
please see the file attachedfor the question

thanks - Dec 4th 2006, 07:08 AMSoltras
This matrix is equivalent to this system:

$\displaystyle x + 3z = b$

$\displaystyle y = -2$

$\displaystyle az = 8$

The first question asks to set $\displaystyle a = 2$ and $\displaystyle b = 3$.

That is, solve:

$\displaystyle x + 3z = 3$

$\displaystyle y = -2$

$\displaystyle 2z = 8$

The third equation tells us that $\displaystyle z = 4$. Substituting this result into the first equation, we get $\displaystyle x + 12 = 3$. So $\displaystyle x = -9$.

That's all. For part (a), the answer is that $\displaystyle x = -9$, $\displaystyle y = -2$, and $\displaystyle z = 4$.

Just do exactly the same steps to solve part (b).