Find the equations of the lines which passes through the point (1.2) and perpendicular to the lines represented by
x2-5xy +4y2=0
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In this problem it decreased 20%

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.