book Maths Puzzle Numerical Ability

(trying to understand my sons homework do not want him just getting the answers but I am lost )
how can I identify an inconsistent system when solving by subtitution?

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book Other Question

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? How do i find the slope of the equation and then graph it? This if for my algebra class