Wen Guotai Daniel's answer to unknown's Secondary 4 A Maths question.
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Apply this key in all 4 questions. They become clear & easy. Cheers!
Date Posted:
6 years ago
Eg, question 1: line 1 is y = -5/3 x +5 and line 2 is y = 3/5 x + 24/5. Since (-5/3)*(3/5)=-1, these two lines are perpendicular to each other.
Wheres question 2 has two lines both of which have positive slope ratios, one is 2/3 and the other 3/2, so they are not perpendicular to each other.
Question 3&4 is just to apply this key in the reverse. Cheers!
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