exam Maths Puzzle Numerical Ability

WHICH RELATION IS NOT A FUNCTION
Y=X+2
Y=X^2-4
X=Y^2-4Y
X=3Y+4

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exam Other Question

The book says to use theorems an exterior angles to prove this proof.

Angles adjacent to the hypotenuse of a right triangle are complementary.

Now all I know is that this pro A farmer drives to town at 40km/h, spends 1.5 hours in town and returns home travelling at 30km/h. If he has been away from home a total of 5 hours, how far is hes farm from town?