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

Three coins are tossed . Find the probability that no more than one coin lands heads up. is it 5/8, 1/4, 3/8, or 1/2

How do I work this out?

Please help

Ellen
5x-2y=-5
y-5x=3