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f(4)=4a+b=5
f(-2)=-2a+b=-7
jadikan persamaan terus dikurangi
6a=12
a=12/6
a=2
4a+b=5
4(2)+b=5
8+b=5
b=-3
b). f(x)=ax+b
f(x)=2a-3
f(4)=4a+b=5
f(-2)=-2a+b=-7
jadikan persamaan terus dikurangi
6a=12
a=12/6
a=2
4a+b=5
4(2)+b=5
8+b=5
b=-3
b). f(x)=ax+b
f(x)=2a-3