exam Maths Puzzle Numerical Ability

PLEASE SOLVE THE FOLLOWING EQUATION WHERE X&Y ARE REAL :
Xi/1-yi=3x-yi/3x+4y

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exam Other Question

solve.

sqrt(y+4)=y-8 Find the value of b for which the equation has exactly one real root. (Hint- think discriminate0

x^2+bx+36=0