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y varies directly with x, and y = 2 when x = 5. What is the value of x when y = 15?

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y varies directly with x so this means y = kx where k is some fixed number
we are told that y = 2 when x = 5 so y = kx 2 = k*5 solve for k

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Other answers:

so 6?
when you solved for k, what did you get
wait how do i solve for k
2 = k*5 divide both sides by 5 to isolate k
k = ???
you divided in the wrong order
good, so y = kx turns into y = 0.4x
now you want to find x when y = 15, so y = 0.4x 15 = 0.4x now solve for x
you nailed it you can also represent 37.5 as the fraction 75/2
so x = 37.5 or x = 75/2
ok thank you(:
you're welcome

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