a)tego niesteyy nie wiem
b )
x-y=3
-5x + 10y=-10
x= 3+y
-5*(3+y) + 10y=-10
x=3+y
-15 -5y+10y=-10
-5y+10y=-10+15
x+3+y
5y=5/:5
y+1
x-1=3
y=1
x=3+1
x=4
c)
x-2y=-4
0,5x+y=2
x=-4+2y
0,5*(-4+2y)+y=2
-2+1y+y=2
-2+2y=2
2y=2+2
2y=4/:2
y=2
x-2*2=-4
x-4=-4
x=0
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a)tego niesteyy nie wiem
b )
x-y=3
-5x + 10y=-10
x= 3+y
-5*(3+y) + 10y=-10
x=3+y
-15 -5y+10y=-10
x=3+y
-5y+10y=-10+15
x+3+y
5y=5/:5
x=3+y
y+1
x-1=3
y=1
x=3+1
y=1
x=4
y=1
c)
x-2y=-4
0,5x+y=2
x=-4+2y
0,5*(-4+2y)+y=2
x=-4+2y
-2+1y+y=2
x=-4+2y
-2+2y=2
x=-4+2y
2y=2+2
x=-4+2y
2y=4/:2
x=-4+2y
y=2
x-2*2=-4
y=2
x-4=-4
y=2
x=0
y=2