Question

If x + 3y = 9 and xy = 7, find the value of x2 +9y2.​

Answer 1

substitute y=x/7 in 1st equation and a quadratic equation comes then find x value using formula

x=-b+sqare root(b2 -4ac) whole divided by 2a

for the quadratic equation ax2+bx+c=0 then sub stitute x value in any equation to get y value then finally substitute x and y values in the asked one to get the final solution

Answer 2

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