A stall sells drinks and sandwiches. Two orders have quantity matrix \(Q=\begin{pmatrix}3&2\ 5&1\en

Question

A stall sells drinks and sandwiches. Two orders have quantity matrix $Q=\begin{pmatrix}3&2\ 5&1\end{pmatrix}$, with rows Order A, Order B and columns drinks, sandwiches. A drink costs $\$2$ and a sandwich costs $\$x$. The total charges satisfy $$Q\begin{pmatrix}2\ x\end{pmatrix}=\begin{pmatrix}14\ y\end{pmatrix}.$$ Find $x$.[2] Find $y$ and explain its meaning.[2]

Accepted Answer

(a) $x=4$ (b) $y=14$; Order B costs $\$14$.

Recovering an unknown price

Recovering an unknown price

Solution:

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