Question

Suatu fungsi di rumuskan f(x) =ax + b jika f(-2)=14 dan f(3) =-1 tentukan nilai f(7)

Answer 1

F(-2) = 14
-2a+b = 14

f(3) = -1
3a+b = -1

eliminasi
-2a+b = 14
3a + b = -1
__________ -
-5a = 15
a = -3 >> b = 8

f(7) = 7a +b = 7(-3)+8 = -21+8 = -13