Question

Help?

1. Find the constant of variation for the relationship f(x)= 30x.

A. 10
B. 30
C. x
D. f(x)

2. 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

Ok the constant of variation is a constant number that f(x) varies by
Let say x=0 then f(x)=0
Lets say x=1 then f(x)=30
Lets say x=2 then f(x)=60
So f(x) is jumping by 30's so what would you assume is the constant of variation?

Answer 2

so lost

Answer 3

You so dont know the basics of algebra ...
Ok lets start from the beggining

Answer 4

We have an equation f(x)=30x
We plug in values such as 1,2 ,3 ,4 5 and 6 .... into our x and then we find out what f(x) equals

So let x=1 what will f(1) equal???
\( f(1)=30(1) = 30\) so f(1)=30
So when x - 1 we know that f(1)=30
Let x=2 what will f(2) equal ?????
\( f(2)=30(2) = 60\) so f(2)=60

So we see that we plug in our x values to find out what f(x) will equal
(Another term for f(x) is y)
So our f(x) is dependent on what x is. We can only find out what f(x) equals once we know what our x equals.

Answer 5

@Alez do you follow so far?

Answer 6

no? lol

Answer 7

srry have been depressed alot and not enough sleef so ya its hard for me to understand alot of things

Answer 8

@johnweldon1993 Can you help out here. Not sure how else to explain this topic

Answer 9

What is a constant?? Its a number that doesnt change
In that equation x can take on any value. We can make x be 1 or 2 or 4 or any number we want and then f(x) equals a number depending on what x equals so both f(x) and x are not constant. They can be many values. Only the 30 stays the same. It is constant