One solution is 10% acid and another is 4% acid. how many cubic centimeters (cc) of each should be mixed to obtain 150 cc of a solution that is 6% acid?

50 cc of 10% acid solution and 100 cc of 4% acid solution should be mixed.

Explanation

Suppose, the amount of 10% acid solution is cc.

As the amount of mixture solution is 150 cc, so the amount of 4% acid solution will be:

Given that, the percentage of acid in the mixture is 6% . So the equation will be.....

So, the amount of 10% acid solution is 50 cc and the amount of 4% acid solution is (150-50)cc = 100 cc

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graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.