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2x = 4 - y / :2
x = 2 -y/2
3x - y = -2 /+y
3x= -2 +y /:3
x = -0,66 + y/3
b) 3x - 2y =0,7 / +2y
3x = 0,7 + 2y /:3
x = 0,23 + 2y/3
2x+y = 0 /-y
2x = -y /:2
x = -y/2
c) 4x +3y = 0 / - 3y
4x = -3y / : 4
x = -0,75y
-2x+2y = 1 /-2y
-2x = 1 -2y /:2
-x = 0,5 -y / -1
x= -0,5+y