book Maths Puzzle Numerical Ability

I need the particular function f(x)=1/(sqrt1-x^2) graphed but i don't understand what or how to graph something like this?

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How can i solve this?

The square root of M^2/N^3.
Describe a first step for solving each system using elimination. Then solve each system.

2x-y=6
-3x+4y=1