book Maths Puzzle Numerical Ability

solve the equation graphically if possible.
x=4+y
y=3+x
thank you
kayla

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book Other Question

FORMULA FOR CALCULATING PERCNTAGE DIFFERENCES OF 1 AMOUNT TO ANOTHER.
SUCH AS $6.00IS WHAT PERCENTAGE OF $5.80? How do i simplify a radical like this...?

3 radical sign 5 = radical sign n
Thank you again