jackandjill11 jackandjill11

05-10-2018
Mathematics

contestada

the function f(x) varies directly with x, and f(x)=12 when x=8

which answer is the direct linear equation?

a) f(x)=8x

b) f(x)=12x

c) f(x)=2/3x

d) f(x)=3/2x

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hellouniverse hellouniverse

05-10-2018

The answer would be d.

You can solve this by changing it up a little, such as changing it to f • x = 12
you can then divide by 8, because x = 8.
You're then left with f = 12/8 or 3/2
multiply by x again on both sides, and voila, f(x)=3/2x

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