Question 943683

If y is directly proportional to u and inversely proportional to the square of v, and y=7 when u=9 and v=6, what is y when u=4 and v=8?
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{{{y = ku/v^2}}}
{{{7 = k(9)/6^2}}}
{{{7 = 9k/36}}}
{{{7 = k/4}}}
k = 7(4), or k = 28 ------ Cross-multiplying

{{{y = ku/v^2}}}
{{{y = 28(4)/8^2}}}
{{{y = 112/64}}}
{{{highlight_green(y = system((7/4)_or,1.75))}}}