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klamra4x+3y=-11 /*4
klamra9x-12y=-3
klamra16x+12y=-44
25x=-47
x= - 47/25
4x+3y=-11
4(-47/25)+3y=-11
3y=-87/25
y=14/25
b)
klamra2x=8-2y
klamray=4-x
y=4-x
2x=8-2(4-x)
2x=-x
x=0
y=4-x
y=4-0
y=4