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maka c1=5.000-1.500=3.500
y2=8.000 ,s2=2.700
c2=8.000-2.700=5.300
∆c=c2-c1
=5.300-3.500
=1.800
∆y=y2-y1
=8.000-5.000
=3.000
b=∆c/∆y
=1.800/3.000
=3/5
1-b=1-3/5 =2/5
fungsi c=a+by
3.500=a+3/5(5.000)
3.500=a+3.000
3.500-3.000=a
500=a
fungsi c=a+by
jadi c=500+3/5y
fungsi s=-a+(1-b)y
jadi s=-500+2/5y