Suatu fungsi dirumuskan f(x) = ax + b. Bila f(-3) = -13 dan f(2) = 42, tentukan nilai a – b!
Jawaban Terkonfirmasi
F(x) = ax + b
f(-3) = -3a + b = -13
f(2) = 2a + b = 42
—————————(-)
-5a = – 55
a = 11
f(-3) = -3a + b = – 13
-3(11) + b = – 13
-33 + b = – 13
b = – 13 + 33 = 20
a – b = 11 – 20 = – 9