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3x-2y=9
x=-11+4y
3x-2y=9
x=-11+4y
-33+12y=9
x=-11+4y
12y=-33+9
x=-11+4y
12y=-24 /:12
x=-11+4y
y=-2
x=-11-8
y=-2
x=-19
y=-2
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b)-2+y=4
5x+4y=-23
y=-2+4
5x+4y=-23
y=2
5x+8=-23
y=2
5x=8-23
y=2
5x=15 |:5
y=2
x=3
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c)2x=3y-2
y-6x=-6
2x=3y-2
y-18y-2=-6
2x=3y-2
17y-2=-6
2x=3y-2
17y=-2-6
2x=3y-2
17y=-8 |:17
2x=3y-2
y=-2,13
2x=-6,39-2
y=-2,13
2x=4,39 |;2
y=-2,13
x=2,1950
y=-2,13
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d)0=5x+4y+14
x=3y+20
5(3y+20)+4y+14=0
15y+100+4y+14=0
19y +114=0
19y=-114
y=-6
x=-6*3+20
y=-6
x=2
y=-6
mam nadzieje że dobrze ;)