Find Covariance Matrix for c1,c2 Given x,y=7,4

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na4aq
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if you've got c1=2x+3x, and c2=x-y, with cov matrix x,y = [7 4].how do you find C = (c1,c2)transpose?
 
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Thank you for helping out.. EnumaElish. Its all clear now.