Question

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?

Answer 1

ok so for this problem, f(x) means y

Answer 2

so it means that is is directly proportional

Answer 3

y=kx

Answer 4

so first we find the constant

Answer 5

3=k12

Answer 6

k=1/4

Answer 7

y=1/4(40)

Answer 8

y=10

Answer 9

so the answer is f(x)=10

Answer 10

f(x)= 10