5x-4y=12 (1)
x-5y=-6;/*5 (2)
5x-25y=-30 (2)
(1)-(2):
5x-4y-5x+25y=12+30
21y=42
y=2
5x-8=12
5x=20
x=4
ответ: (4;2)
5x-4y=12 (1)
x-5y=-6;/*5 (2)
5x-4y=12 (1)
5x-25y=-30 (2)
(1)-(2):
5x-4y-5x+25y=12+30
21y=42
y=2
5x-8=12
5x=20
x=4
ответ: (4;2)
x-5y=-6
5(-6+5y)-4y=12
x=-6+5y
-30+25y-4y=12
21y=42
y=2
x=-6+5×2
x=4
(4;2)