Question

Решите пж, даю 30 баллов

Answer 1

$\displaystyle\bf\\1)\\\\7d-5t-3=0\\\\\Big(2 \ ; \ 8\Big)\\\\7\cdot2-5\cdot8-3=0\\\\14-40-3=0\\\\-29\neq 0\\\\\\\Big(1 \ ; \ \frac{4}{5}\Big)\\\\7\cdot 1-5\cdot \frac{4}{5} -3=0\\\\7-4-3=0\\\\0=0-verno\\\\\\\Big(8 \ ; \ 10,6\Big)\\\\7\cdot 8-5\cdot 10,6-3=0\\\\56-53-3=0\\\\0=0-verno\\\\\\\Big(15 \ ; \ 1\Big)\\\\7\cdot 15-5\cdot 1-3=0\\\\105-5-3=0\\\\97\neq 0\\\\\\Otvet: \ \Big(1 \ ; \ \frac{4}{5} \Big) \ \ , \ \ \Big(8 \ ; \ 10,6\Big)$

$\displaystyle\bf\\2)\\\\\frac{x+y}{4} =1\\\\x+y=4\\\\\boxed{y=-x+4}$