2x-y=-7
4(x+1)+2y=18
2x - y= -7
4x +4 + 2y= 18
2x-y= -7 /* (-2)
4x + 2y = 14
-4x +2y = 14
4x +2y = 14
-4x + 2y + 4x + 2y= 14+14
4y= 28 /:4
y= 7
2x -y= -7
2x -7 = -7
2x = -7+7
2x =0 /:2
x= 0
2x-y=-74(x+1)+2y=182x-y=-7 | *2
4x+4+2y=14
4x-2y=-144x+2y=14
--------------+8x=0 |:8x=02*0-y=-7x=0
-y=-7| *(-1)
x=0
y=7
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2x-y=-7
4(x+1)+2y=18
2x - y= -7
4x +4 + 2y= 18
2x-y= -7 /* (-2)
4x + 2y = 14
-4x +2y = 14
4x +2y = 14
-4x + 2y + 4x + 2y= 14+14
4y= 28 /:4
y= 7
2x -y= -7
2x -7 = -7
2x = -7+7
2x =0 /:2
x= 0
2x-y=-7
4(x+1)+2y=18
2x-y=-7 | *2
4x+4+2y=14
4x-2y=-14
4x+2y=14
--------------+
8x=0 |:8
x=0
2*0-y=-7
x=0
-y=-7| *(-1)
x=0
y=7
x=0