Which equation is the direct variation equation if f(x) varies directly with x and f(x)=-2 when x=6

question 3 options:

f (x)=- 2 x

f (x )=-1 /2 x

f (x )=-6 x

f (x )= -18 x

Step-by-step explanation

Given f is a direct variation equation (Direct variation is when one variable is equal to a constant times another variable, with no additions or subtractions alongside).

Now by the above condition let the constant be "c".Then

also given that when

on substituting the above values,

Therefore our equation is