book Maths Puzzle Numerical Ability

How would you solve y=-1/3+23/3 then graph it?

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book Other Question

how many kilograms of coffee beans selling for $2.40 per kilogram should be mixed with 3 KG of cofee beans selling for $4.00 per KG to obtain a mixture selling for $2.88 per KG? I need help simplifying this problem:

6-x over x-6 (divison)