Diketahui f(x)=ax+5b-7. Jika f(0)=8 dan f(1)=12. Nilai a dan b berturut turut adalah...
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F(0) = 5b - 7 = 8
f(1) = a + 5b -7 = 12
5b - 7 = 8
5b = 15
b = 3
a + 5(3) - 7 = 12
a + 15 - 7 = 12
a + 8 = 12
a = 4