13.
aprīlī
Diagnosticējošais darbs ANGĻU VALODĀ 9.KLASEI
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### Uzdevums:

6,5p.
Risināsim kopīgi sistēmu $\left\{\begin{array}{l}8x+9y=-10\\ 9x+8y=-7\end{array}\right\$

$\begin{array}{l}\left\{\begin{array}{l}8x+9y=-10 \phantom{\rule{0.147em}{0ex}}|\cdot 9\\ 9x+8y=-7\phantom{\rule{0.147em}{0ex}}|\cdot \left(-i\right)\end{array}\right\\\ \\ \underset{¯}{\left\{\begin{array}{l}i\phantom{\rule{0.147em}{0ex}}x+i\phantom{\rule{0.147em}{0ex}}y=i\\ i\phantom{\rule{0.147em}{0ex}}x-i\phantom{\rule{0.147em}{0ex}}y=i\end{array}\right\\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}|+}\\ \phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}i\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}y=i\end{array}$

turpini...

$\left\{\begin{array}{l}x=i\\ y=i\end{array}\right\$
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