Re: PLease help, matrices

Let x be the total number of lots of "twelve Dual Core processor chip and 2048 MB of RAM" ordered and let y be the total number of lots of "nine Dual Core processor chip and 2560 MB of RAM" ordered. Then the total number of Dual Core processor chips ordered is 12x+ 9y and total RAM ordered is 2048x+ 2560y. The **cost** will be 1200x+ 960y. You can write that information as

$\displaystyle \begin{bmatrix}12 & 9 \\ 2048 & 2560 \\ 1200 & 960\end{bmatrix}\begin{bmatrix}x \\ y\end{bmatrix}= \begin{bmatrix}P \\ M \\ C\end{bmatrix}$

where "P" is the number of processor chips, "M" is the memory in MB of RAM and C is the cost.

What must x and y be so that P= 1 and M= 0? What is C in that case?

What must x and y be so that P= 0 and M= 256? What is C in that case?