Please Help WILL MEDAL !!!!!!!!!!!!!!!!!! And FAN If f(x) varies directly with x and f(x) = 3 when x = 12, then what is the value of f(x) when x = 40?
(Points : 4)
480
160
10
4

Question

Please Help WILL MEDAL !!!!!!!!!!!!!!!!!!   And FAN                                                                         If f(x) varies directly with x and f(x) = 3 when x = 12, then what is the value of f(x) when x = 40? 
(Points : 4)
       480
       160
       10
       4

barreraa · Answer

@AlexandervonHumboldt2

anonymous · Answer

Because the variation is direct, there is no 'b' term in the equation y = mx + b. Therefore, you can say 3 = m(12) which would make m = 0.25
Put in 40 for x and you will get (.25)(40) = 10