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x+y+1=0 -3x-8y-20=0 / ÷(-3) 2x+y-3=0
x=-y+3 -¾x-2y-5=0 3x-4y+1=0
-y+3+y+1=0 x+8/3y+20/3=0 y=-2x+3
x=-y+3 -¾x-2y-5=0 3x-4(-2x+3)+1=0
4=0 x=-8/3y-20/3 y=-2x+3
r. sprzeczne
-¾( -8/3y-20/3)=0 3x+8x-12+1=0
x=-8/3y-20/3 y=-2x+3
2y+5-2y-5=0 11x=11 /÷11
x=-8/3y-20/3 y=-2x+3
0=0 x=1
x=-8/3y-20/3 y=-2×1+3
r. nieoznaczone
x=1
y=1
r.oznaczone