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I had gotten 4=10*25

How would I find y if x=25?

I'm not really understanding.

y varies with x
means
y=kx

Ok

assuming it varies directly anyways

oh actually that is the form it gives in the last sentence

so we can find k given (x,y)=(10,4)

replace x with 10
replace y with 4
and solve for the constant k

10/4

so you replace y with 4
and x with 10
in the equation y=kx
so that g ives
4=k(10)
try again...

k is being multiplied by 10

to get k by itself you need to divide both sides by 10

4/10=10k/10 ?

so k=?

.4

so you had y=kx
and you just found k to be .4
y=.4x

this is the equation you have and now you know k

Oh thank you soo much!!

now the last step is to solve for y when x is 25

ok one sec

y=.4x
y=.4(25)

10

yes 4*25 is 100
since 4 quarters is a dollar
and .4*25=10
great
so when x is 25 y is 10

Thanks

np