Question

решиье за 40, 2 задания​

Answer 1

$4)\quad 7x-3y=3\quad (-3;y)\\\\7\cdot(-3)-3y=3\\\\-21-3y=3\\\\-3y=3+21\\\\-3y=24\\\\3y=-24\\\\\boxed{y=-8}\\\\\\5)\quad5x-3y=a\quad(-1;3)\\\\5\cdot(-1)-3\cdot3=a\\\\a=-5-9\\\\\boxed{a=-14}$