book Maths Puzzle Numerical Ability

can anyone tell me how to graph an equation, for example like
y = 2x + 2

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book Other Question

My wallet contains $3409.00 in ones, twenties, and fifties. Find the number of each kind of bill if there are 6 fewer ones than twenties and 24 more twenties than fifties. 1 square yard=how many square inches?