exam Maths Puzzle Numerical Ability

Are these equations linear and,if not, explain.

x/2-y=7

G(X)=2/X-3

X=3+y

f(x)=7

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exam Other Question

This is not from a textbook!

divide and check!

64x^8 - 24x^7 +16x^2
_____________________
8x^2
x^2-7x+10=0