exam Maths Puzzle Numerical Ability

solve.

sqrt(y+4)=y-8

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exam Other Question

Solve the open sentence and name and graph the solution set. Please and thank you, to I can have a clear understanding of what I am doing.

|z-2|≤5
PLEASE SOLVE THE FOLLOWING EQUATION WHERE X&Y ARE REAL :
Xi/1-yi=3x-yi/3x+4y