book Maths Puzzle Numerical Ability

Graph the equations
1. xy= -6
2 x^2 + 9y^2 = 9
3. x = y^2 -2

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book Other Question

Given the equation y-3/6 - 3x-y/9 = 4 - x+2y/4 + x+4y/12 and g(y) is a cyclist bikes x distance at 10 miles per hour and returns over the same path at 8 miles per hour. What is the cyclist average rate for the round trip in miles per hour.