Question

F(x)=5x-7/9
Tentukan
f(c)=8/9

Answer 1

Ada 2 kemungkinan

f(x) = (5x - 7) /9
f(c) = (5c -7) /9
8/9 = (5c -7)/9
8 = 5c -7
8 + 7 = 5c
5c = 15
c = 3

Kemungkinan lain
f(x) = 5x - (7/9)
8/9 = 5c -(7/9)
8/9 + 7/9 = 5c
15/9 = 5c
15/9 × 1/5 = c
15/45 = c
c = 1/3