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S=(x,y)
x=1/2*(2+1)=1,5
y=1/2*(7+1)=4
S=(3/2, 4), C=(3,6)
y=ax+b
3/2 a+b=4
3a+b=6
------------ _
-1,5a=-2 /:(-3/2)
a=2*2/3=4/3
3/2*4/3 +b=4
2+b=4
b=4-2=2
Odp. y=4/3 x+2