Question

Question number 21
Solve it plz..​

Answer 1

for collinearity

$= > |x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2)| = 0 \\ \\</p><p> = > |a(b - 1) + 0(1 - 0) + 1(0 - b)| = 0 \\ \\ = > |ab - a - b| = 0 \\ \\</p><p> = > ab - a - b = 0 \\ \\</p><p> = > \frac{ab}{ab} - \frac{a}{ab} - \frac{b}{ab} = \frac{0}{ab} \\ \\</p><p> = > 1 - \frac{1}{b} - \frac{1}{a} = 0 \\ \\</p><p> = > 1 = \frac{1}{a} + \frac{1}{b} \\ \\</p><p> = > \frac{1}{a} + \frac{1}{b} = 1$

Answer 2

Step-by-step explanation:

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