exam Maths Puzzle Numerical Ability

Is this equation a linear equation?

y = x2 + 4

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exam Other Question

y2-3x+2=3x2
Okay I need work in solving for y in terms of x line by line?????????
Then say if it is a function or not and explain why or why not
HELP/thanks The graph of the function f(x)=1/x is shown below. Find the equation and graph the function g(x) which is the reflection of f(x)in the y-axis. The graph has to curves in quadrant 1 and 3. I don;t know how to do this and am looking for help with this.