Question

Решите методом подстановки 2x+3y=10 z-2y=-9

Answer 1

2x+3y=10
x-2y=-9

x = 2y - 9

2(2y - 9) + 3y = 10

4y - 18 + 3y = 10
7y - 18 = 10
7y = 28
y = 4

x = 8 - 9
y = -1