Question

Suatu fungsi dirumuskan f(x)=ax+b jika f(-1)=-5 dan f(4)=5 maka nilai f(6) adalah

Answer 1

F(-1) = -5
-a+b = -5

f(4) = 5
4a+b = 5

-a+b = -5
4a+b = 5 -
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-5a = -10
a = -10:(-5)
a = 2

-a+b = -5
-2+b = -5
b = -5+2
b = -3

f(x) = 2x-3
f(6) = 2×6-3
f(6) = 12-3
f(6) = 9