EM-2136

Displaying data in matrices

E Math · Secondary 4 · Hard · Displaying data in matrices

A shop sells apples, bread and juice. In Shop X, they cost \$2.40, \$3.10 and \.80 respectively. In Shop Y, they cost \$2.10, \$2.80 and \$2.20 respectively. This is represented by matrix

A = \begin{pmatrix}2.4 & 2.1\\3.1 & 2.8\\1.8 & 2.2\end{pmatrix}

.

Customer P buys 4 apples, 2 bread and 3 juice. Customer Q buys 1 apple, 5 bread and 2 juice. Represent this information in a

2\times 3

matrix

B

$\begin{pmatrix}4 & 2 & 3\\1 & 5 & 2\end{pmatrix}$
$\begin{pmatrix}4 & 1 & 2\\2 & 5 & 3\end{pmatrix}$
$\begin{pmatrix}4 & 2\\3 & 1\\5 & 2\end{pmatrix}$
$\begin{pmatrix}2 & 3 & 4\\5 & 2 & 1\end{pmatrix}$

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