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If x-y=7\ a n d\ x y=9, find the value o...

If `x-y=7\ a n d\ x y=9,` find the value of `x^2+y^2`

A

67

B

57

C

47

D

37

Text Solution

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The correct Answer is:
A
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(i) x+2y=-7 and 3x-2y=-1, then find the value of x. (ii) If x+y=8 and 4y-x=2, then find the value of y. (iii) If 3x+5y=9 and 5x+3y=7, then find the value of x+y. (iv) If 3x-y=11 and x-3y=17, then find the value of x-y.