exam Maths Puzzle Numerical Ability

I do not know the steps in graphing the following
X-Y=6
NEED A RESPONSE AS QUICKLY AS POSSIBE AS I AM PREPARING FOR A TEST SHORTLY
THANKS CARMEN

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how do you do problem number 6 A chemist mixes distilled water with a 90% solution of sulfuric acid to produce a 50% solution. If 5 liters of distilled water is used, how much 50% solution is produced?