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y=2x+8+3
y=2x+11
y=ax+b
a=-1/2 - bo prostopadła
1=-1/2*1+b
-1/2+b=1
b=1+1/2
b=1,5
y=-1/2x+1.5
y-3=2x+8
y+2x=3+8
2xy=11:2
xy=5.5