exam Maths Puzzle Numerical Ability

Can someone please help me. I do not know how to graph an equation like this one.
Graph f(x)=-2x+4

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exam Other Question

One side of a rectangular stage is 2meters longer than the other. If the diagonal is 10 meters, then what are the lengths of the sides? 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?