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Can you help me find the covariance of $\mathrm{Cov}(5X+3Y, 7X-Y)$ I've been looking up formulas all day and I can not find on that adds both x and y just constants. Thank you! $Mx=2, My=7, \mathrm{Var}X=4, \mathrm{Var} Y=9$, and $\mathrm{Cov}(X,Y)=-2$

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    By $MX$, do you mean the expectation of $X$?2012-03-30

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