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f(-2)=-2a+b=-8
subtitusikan
3a+b=2
-2a+b=-8
= a=2, -2(2)+b=-8, b= -8+4=-4
f(x)=ax+b= 2a-4
f(3)=2
==> a(3)+b=2
3a +b =2 (i)
f(-2)=-8
==> a(-2)+b=-8
-2a+b =-8 (ii)
gunakan metode eliminasi
3a+b=2
-2a+b=-8
-------------- -
5a =10
a =2
substitusikan
3a+b=2
3(2)+b=2
6+b=2
b =2-6
b =-4
f(x) = ax+b
=2x +(-4)
=2x-4