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f(-5) = -5a - b = -25
------------------ -
8a = 32
a = 32/8 = 4
f (3) = 3a -b =7
= 3(4) - b = 7
= 12 -b =7
= 12-7 = b
5 = b
f(x) = ax-b
f(x) = 4x -5
jadi rumusnya adalah f(x) = 4x - 5
jadikan sebagai yang terbaik ya::)
Maka, f(3)= 3a-b = 7 |x5| 15a - 5b= 35
f(-5)= -5a-b= -25 |x3| -15a- 3b= -75
_________ _ -------------------- +
-2a = -18 -8b = -40
a = 9 b = 5
Jadi rumus fungsi f adalah f(x)=9x - 5