Question 47773
Since this is direct variation, use the formula:
y=x^2k ["k" is the constant that does not change]
This means that as y changes, x changes.  If y is increased, x is increased. If y decreases, x will also decrease. "k" will stay the same.
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Since x=2 and y=4, than plug-in the values and solve for "k"
4=2^2k
4=4k
4/4=4k/4
1=k
So, y=x^(1)
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For an indirect variation, use the formula:
y=k/x [And plug-in the values]
This means that as y changes, x changes inversely.  That is, as y increases, x decreases.  If y decreases, x increases.  In either case, "k" will stay the same.