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f(-2)=a(-2)+b
18=-2a +b ... persamaan 1 *-2a+b=18
*F(x)=ax+b -2(-4)+b=18
f(4)=a(4)+b 8+b=18
-6=4a+b.. persamaan 2 b=18-8 =10
**-2a+b=18
4a+b=-6 -
-6a = 24
a= 24:(-6)
a= -4
b. bentuk fungsi :
f(x)=ax+b
f= -4x + 10