suatu fungsi dirumuskan f(x) = 7x-1 , jika f(a) = 48 dan f(b) = -22. maka nilai a+b adalah?

f(a) = 7a-1 = 48
7a = 48+1= 49
a= 49/7 = 7

f(b) = 7b-1=-22
7b = -22+1 = -21
b = -21/7 = -3

a+b = 7+ (-3)
= 4

semoga membantu