Odpowiedź :
5y=2
x+y=2⅖
y=2/5
x+2/5=2 2/5
x=2
c 4y-x=6
17y=0
4y-x=6
y=0
0-x=6
x=-6
a) x+3y=3
x-y=5
x=3-3y
x-y=5
x=3-3y
3-3y-y=5
x=3-3y
-4y=2
x=3-3y
y=-1/2
x=3-3*(-1/2)
x=3/2
2x-y=10
x+5y=-17
x=-17-5y
2x-y=10
x=-17-5y
2(-17-5y)-y=10
x=-17-5y
-34-11y=10
x=-17-5y
-11y=44
x=-17-5y
y=-4
x=-17-5(-4)
x=3
x+y=2⅖
y=2/5
x+2/5=2 2/5
x=2
c 4y-x=6
17y=0
4y-x=6
y=0
0-x=6
x=-6
a) x+3y=3
x-y=5
x=3-3y
x-y=5
x=3-3y
3-3y-y=5
x=3-3y
-4y=2
x=3-3y
y=-1/2
x=3-3*(-1/2)
x=3/2
2x-y=10
x+5y=-17
x=-17-5y
2x-y=10
x=-17-5y
2(-17-5y)-y=10
x=-17-5y
-34-11y=10
x=-17-5y
-11y=44
x=-17-5y
y=-4
x=-17-5(-4)
x=3
5y=2 | :5
x+y=2,4
y=0,4
x=2,4-0,4
y=0,4
x=2
4y-x=6
17y=0 |:17
4y-x=6
y=0
x=-6
y=0
a=b
2a+b=9
a=b
2a+a=9
a=b
3a=9|:3
a=b
a=3
b=a
a=3
b=3
a=3
-------------------------------------------
x+3y=3
x-y=5
x+3y=3
x=5+y
5+y+3y=3
x=5+y
4y=-2 |4
x=5+y
y=-½
x=5+(-½)
y=-½
x=4½
2x-y=10
x+5y=-17
2x-y=10
x=-17-5y
34-10y-y=10
x=-17-5y
-11y=44|:(-11)
x=-17-5y
y=-4
x=-17+20
y=-4
x=3
x+y=2,4
y=0,4
x=2,4-0,4
y=0,4
x=2
4y-x=6
17y=0 |:17
4y-x=6
y=0
x=-6
y=0
a=b
2a+b=9
a=b
2a+a=9
a=b
3a=9|:3
a=b
a=3
b=a
a=3
b=3
a=3
-------------------------------------------
x+3y=3
x-y=5
x+3y=3
x=5+y
5+y+3y=3
x=5+y
4y=-2 |4
x=5+y
y=-½
x=5+(-½)
y=-½
x=4½
2x-y=10
x+5y=-17
2x-y=10
x=-17-5y
34-10y-y=10
x=-17-5y
-11y=44|:(-11)
x=-17-5y
y=-4
x=-17+20
y=-4
x=3