Solve for u, x, y, and z in the matrix equation. 
Definitions:
Negative Relationship
A relationship between two variables in which an increase in the value of one variable is associated with a decrease in the value of the other variable. It is illustrated by a curve that slopes downward from left to right.
Quantity Demanded
The aggregate quantity of a product or service that buyers are prepared to buy at a specified price point.
Quantity Demanded
The aggregate demand for a product or service, defined as the overall quantity that buyers are ready and capable of buying at a specific price point in the marketplace.
Quantity Demanded
The complete sum of a certain good or service that consumers are ready and capable of buying at a determined price level.
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