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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please help me. i cant figure out how to do this. thank you for your time in trying to figure this out!
compare the graph of the function with the graph of f(x)=square root x.
y=-squarerootx Ryan bought 8 pens and 7 pencils and paid a total of $14.70. Ashley purchased 4 pens and 6 pencils and paid $8.60. Find the cost for a single pen and a single pencil