<span>Х+2у=8 </span>
<span>5х-3у=1</span>
<span>х=8 - 2у</span>
<span>5(8-2у)-3у=1</span>
<span>40-10у-3у-1=0</span>
<span>-13у+39=0 /-13</span>
<span>у+3=0</span>
<span>у=-3</span>
<span>если у=-3,то х=14</span>
<span>
</span>
<span><span>у-3х=-4</span></span>
<span><span>2у+5х=25</span></span>
<span><span>у=3х-4</span></span>
<span><span>2(3х-4)+5х-25=0</span></span>
<span><span>6х-8+5х-25=0</span></span>
<span><span>11х-33=0 /11</span></span>
<span><span>х-3=0</span></span>
<span><span>х=3 </span></span>
<span><span>Если х=3,то у=5</span></span>
<span>
</span>
<span>
</span>
<span>
</span>