Question

СРОЧНО! даю 50 балов​

Answer 1

$\displaystyle\bf\\y=-2x+7\\\\\\-1\leq x\leq 4 \ |\cdot(-2)\\\\-8\leq -2x\leq 2\\\\-8+7\leq -2x+7\leq 2+7\\\\-1\leq -2x+7\leq 9\\\\\\\boxed{-1\leq y\leq 9}$