diketahui f(x)=axb dengan f(2)=-3 dan f(7)=17 nilai a=

f(x) = ax + b

f(2) = 2a + b
-3 = 2a + b

f(7) = 7a + b
17 = 7a + b

Eliminasi
2a + b = -3
7a + b = 17
_________-
-5a = -20
a = 4

subtitusi
2a + b = -3
2(4) + b = -3
b = -3 - 8
b = -11

nilai a yaitu 4 dan b yaitu -11

f(7)=a.7.b=17
f(2)=a.3.b=-3
_______ -
a3 =20
a =20÷3
a =6,333