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F(4)=4a+b=19
F(2)=2a+b=7
Dikurangi
2a. =12
a =12/2
a= 6
Mencari b
2a+b=7
2×6+b=7
12+b=7
b=7-12
b=-5
A. a=6 b=-5
B. Fungsi f dinyatakan
f(x)=6x+(-5)
C. Nilai dari f(-3)=6×-3+(-5)
=-18+(-5)
=-18-5
=-23