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y=4
y=ax+b
uklad rownan
1=a+b
2=6a+b
-a=b-1
a=-b+1
2=6(-b+1)+b
2=-6b+6+b
2=-5b+6
5b=6-2
5b=4
b=4/5
a=-b+1
a=-4/5+1
a=1/5
y=1/5x+4/5
y=4
4=1/5x+4/5 //*5
20=x+4
-x=4-20
-x=-16
x=16
c=16