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Kaylis [27]
3 years ago
15

In the form of the matrice, how do you work out the following simultaneous equation?

Mathematics
1 answer:
lapo4ka [179]3 years ago
4 0
\left[\begin{array}{ccc}1&3&7\\1&1&1\end{array}\right]
multiply 2nd row by -1 and add to first row
\left[\begin{array}{ccc}0&2&6\\1&1&1\end{array}\right]
divide the 1st row by 2
\left[\begin{array}{ccc}0&1&3\\1&1&1\end{array}\right]
multiply the first row by -1 and add to 2nd row
\left[\begin{array}{ccc}0&1&3\\1&0&-2\end{array}\right]

now we know
y+3=0
x-2=0

therefor
y=-3
x=2
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