In an examination, 48% of students passed in History only and 35% passed in Geography only. If 12% of the students were failed in both subjects, (i) What percent of students passed in both subjects? (ii) What percent of students passed in Mathematics? (iii) Represent all results in a Venn-diagram. nce only​

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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.

if you was gonna solve for a, a is a   < -12