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I had gotten 4=10*25
How would I find y if x=25?
How do I solve this problem? @freckles
I'm not really understanding.
y varies with x means y=kx
assuming it varies directly anyways
oh actually that is the form it gives in the last sentence
y=kx so anyways you need to find the constant of variation k constant means no matter what x and y is the constant will keep being the same number
so we can find k given (x,y)=(10,4)
replace x with 10 replace y with 4 and solve for the constant k
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
10/10=1 and 1k=k so you have 4/10=k right? and you can reduce 4/10 as 2/5 or I guess you can choose also to write it as .4 as you just did
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
yes 4*25 is 100 since 4 quarters is a dollar and .4*25=10 great so when x is 25 y is 10