exam Maths Puzzle Numerical Ability

Is sqrt (x^2) = x an identity (true for all values of x)?

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exam Other Question

Graph each of the following inequalities.

4x + y _> 4

x
GRAPH
y

I do not understand this graph stuff there is a graph on the page inbetween the X AND Y where it says GRA My question is can you help me solve this equation? This problem is a Substition.

x+2y=13
3x-5y=6

I do not understand how to find x and y for this equation. If you could help it would be great. Thank you.