exam Maths Puzzle Numerical Ability

2 - 4x + 7x + 8 < 6x - 5x

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exam Other Question

I am not sure how to determine if a relation is a function and my texbook does not give a good example. Please help!
x^2=1+y^2

Thank you. Rewrite the equation so y is a function of x.
-7x + y = 8