Ответ:

a) y=? x=-18

y = -7/9 * x = -7/9 * (-18) = 14

y=?, x = 9/49

y = -7/9 * x = -7/9 * 9/49 = -1/7

б) x=? y=-2

y = -7/9 * x

-2 = -7/9 * x

x = 2 / (7/9) = 18/7

x=? y=0

y = -7/9 * x

0 = -7/9 * x

x = 0

x=? y=3

y = -7/9 * x

3 = -7/9 * x

x = -3 / (7/9) = -27/7

Пошаговое объяснение: