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5x+5y= 0|*(-2)
10x-15y=50
-10x-10y=0
10x-15y-10x-10y=50+0
-25y=50|:(-25)
y=-2
10x-15*(-2)=50
10x+30=50
10x=50-30
10x=20|:10
x=2
spr.10*2-15*(-2)=50
20+30=50
50=50
l=p
b) { 5v1 +4v2 = 4
7v1+ 5v2 = 6
25v1+20v2=20
-28v1-20v2=-24
25v1+20v2-28v1-20v2=20-24
-3v1=-4|:(-#)
v1=4\3
25*4\3+20v2=20
100\3+20v2=20
32 4\3-19 3\3+-20v2
13 1\3=-20v2
40\3=-20v2|:(-20)
-2\3=v2
v2=-2\3