a)4x-6y=2
x+y=3
y=3-x
4x-6(3-x)=2
4x-18+6x=2
10x=20 x = 2 => y=1
б) 2x-6y=-2
2x+y = 5
y = 5-2x
2x-6(5-2x)=-2
2x-30+12x=-2
14x=28 x=2 y=1
в) 4x-y=7
2x+7y=11
y=4x-7
2x+7(4x-7)=11
2x+28x-49=11
30x=60 x=2 y=1
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Answers & Comments
a)4x-6y=2
x+y=3
y=3-x
4x-6(3-x)=2
4x-18+6x=2
10x=20 x = 2 => y=1
б) 2x-6y=-2
2x+y = 5
y = 5-2x
2x-6(5-2x)=-2
2x-30+12x=-2
14x=28 x=2 y=1
в) 4x-y=7
2x+7y=11
y=4x-7
2x+7(4x-7)=11
2x+28x-49=11
30x=60 x=2 y=1