exam Maths Puzzle Numerical Ability

I have a question in geometry about coordinates and graphing, but I cannot exactly scan my book onto the computer, so can you try to find my book and problem?

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Can someone please help me. I do not know how to graph an equation like this one.
Graph f(x)=-2x+4
Hello. Can you please help me with these? This comes from my college algebra class. My problem is how to rationalize the denominator:

1. x/sqrt[x-1]-sqrt[x]
2. ((2/sqrt[2-x])