Объяснение:
2x+y=11
3x-y=9
2x+y+3x-y=11+9
5x=20
x=20÷5
x=4
3×4-y=9
-ý=9-12
y=12-9
y=3
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Объяснение:
2x+y=11
3x-y=9
2x+y+3x-y=11+9
5x=20
x=20÷5
x=4
3×4-y=9
-ý=9-12
y=12-9
y=3