Question

If f(x) varies directly with x, and f(x) = 48 when x = 8, find the value of f(x) when x = 2

A. 12

B. 6

C. 8

D. 3

Answer 1

i think its b im not sure though

Answer 2

b

Answer 3

because 6x8=48

Answer 4

@hexagon001
Not looking for the constant of proportionality, rather, the value of f(x) when x = 2 ;)

Answer 5

ahh reading too fast and i end up missing the ending

Answer 6

so itll be A

Answer 7

Just so you know what you're doing, @Cookie_009
If a and b are two values that vary directly, then that only means

a = kb
for some constant k.

So, it's given that f(x) varies directly with x, so it means
f(x) = kx, for some constant k, right?

Answer 8

yep

Answer 9

Okay :)
So, when x is 8, f(x) is 48, right?

Answer 10

yes

Answer 11

So...
f(x) = kx
48 = k(8)
right?

Answer 12

yess

Answer 13

Well
48 = 8k
It's just a matter of finding k :)