Question

помогите решить, срочно​

Answer 1

$\left\{\begin{array}{ccc}2x+3y=17\\0,5x-2y=-4 \ |\cdot(-4)\end{array}\right\\\\\\+\left\{\begin{array}{ccc}-2x+3y=17\\2x+8y=16 \ \end{array}\right\\----------\\11y=33\\\\\boxed{y=3}\\\\2x=17-3y=17-3\cdot3=17-9=8\\\\x=8:2=4\\\\\boxed{x=4}\\\\x-y=4-3=1\\\\Otvet:\boxed1$