Give me the answer of 9 x squared plus y squared is equal to 58 and x y is equal to 7 then find the value of 3 x + y
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(x+y) 2=x^2+y^2+2xy
So,(3x+y)^2=9x^2+y2+2x7
(3x+y)^2=58+14
(3X+y)^2=72
(3x+y)=6root2
So,(3x+y)^2=9x^2+y2+2x7
(3x+y)^2=58+14
(3X+y)^2=72
(3x+y)=6root2
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