suatu fungsi g dinyatakan dgn rumus g(x)=ax+b.diketahui g(5)=15 dan g(10)=5.Nilai dri 2a-b= tolong beserta caranya

g(x) = ax+b
g(5)    = a.(5) + b =15 (-)
g(10)   =a.(10) + b = 5
= -5a = 10
 a = 10/-5
 a = -2

5a + b = 15
5.(-2) + b = 15
-10 + b = 15
b = 15+10
b = 25

2a-b =2.(-2)-25
        =-4-25
        = -29.

maaf kalo salah :)