Question

Write the appropriate rotation formulas so that in a rotated system the equation has no x'y'-term.
10x^2-4xy+6y^2-8x+8y=0

Answer 1

A. x = -y'; y = x'


B. x = x' - y'; y = x' + y'


C. x = (x' - y'); y = (x' + y')


D. x = x' - y'; y = x' + y'
**The answer is either B or D**

Answer 2

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