Question

5х+3у=11 7х+17у=-23 помогите решить

Answer 1

$left { {{5x+3y=11|*7} atop {7x+17y=-23|*(-5)}} right.$
$left { {{35x+21y=77} atop {-35x-85y=115}} right.$
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-64y=192
y=-3

$left { {{5x-9=11} atop {y=-3}} right.$
$left { {{x=4} atop {y=-3}} right.$