exam Maths Puzzle Numerical Ability

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y<=-6

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exam Other Question

Are these equations linear and,if not, explain.

x/2-y=7

G(X)=2/X-3

X=3+y

f(x)=7 I don't understand how to do this:

Find the equation of the parabola with vertex (3/2,-1/2), horizontal axis of symmetry, + passing through (-3,1). Write the equation in stand