If five notebooks cost 5.25 how much would three notebooks cost

So what you would do is you take 5.25 and divide it by 3 and get 1.75 and to check that do the opposite just do 1.75 times 3 and see if you get 5.25 
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You would need a laid out graph for this but could you provide a picture of just a graph? i can give stepssolve for y.subtract 4xdivide by -1 (opposites)graph slope intercept formcheck each point to see if it’s on the graph