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3x+y+6=0 /-6
2x-y=1 /+y
3x+y=-6
2x=1+y
3 (1+y)+y=-6
2x=1+y
3+3y+y=-6 /-3
2x=1+y
4y=-10 /:4
2x=1+y
y=-2,5
2x=1+y
2x=1+(-2,5)
2x=-1,5 /:2
x=-0,75
3x+y+6=0
2x-y=1
3x+y=-6
5x=-5/:5
x= -1
2×(-1) -y=1
-2-y=1
-y=3/:(-1)
y=-3
3x+y+6 = 0
2x-1 = y
3x+y = -6
y = 2x-1
3x+2x-1 = -6
y = 2x-1
5x = -6+1
y = 2x-1
5x = -5 |:5
y = 2x-1
x = -1
y = 2*(-1)-1
x = -1
y = -2-1
x = -1
y = -3
x = -1