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f(2)=7
7=2a+b ... (p1)
f(x)=ax+b
f(4)=11
11=4a+b ...(p2)
eliminasi (p1) dan (p2)
2a+b=7
4a+b=11
------------ --
-2a. =-4
a. =-4
a. =2
a=2 >>>>> 11 = 4a+b
11=4.2+b
11=8+b
11-8=b
b=3
f(x)=ax+b
f(x)=2x+3
f(h)=3
3 =2h+3
3-3=2h
0. =2h
h. =0