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Linear system/Simultaneous/1/Exercise
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Solve the
linear systems
(
7
4
1
2
)
(
x
1
y
1
)
=
(
4
9
)
,
(
7
4
1
2
)
(
x
2
y
2
)
=
(
6
5
)
,
(
7
4
1
2
)
(
x
3
y
3
)
=
(
−
2
5
)
{\displaystyle {\begin{pmatrix}7&4\\1&2\end{pmatrix}}{\begin{pmatrix}x_{1}\\y_{1}\end{pmatrix}}={\begin{pmatrix}4\\9\end{pmatrix}},\,{\begin{pmatrix}7&4\\1&2\end{pmatrix}}{\begin{pmatrix}x_{2}\\y_{2}\end{pmatrix}}={\begin{pmatrix}6\\5\end{pmatrix}},\,{\begin{pmatrix}7&4\\1&2\end{pmatrix}}{\begin{pmatrix}x_{3}\\y_{3}\end{pmatrix}}={\begin{pmatrix}-2\\5\end{pmatrix}}}
simultaneously.
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