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प्रश्न
Find the relation between x and y if, the points A(x, y), B(-5, 7) and C(-4, 5) are collinear.
उत्तर
Given, the pointsA(x,y), B(-5,7) and C(-4,5) are collinear.
So, the area formed by these vertices is 0.
1/2[x(7-5)+(-5)(5-y)+(-4)(y-7)= 0
1/2[2x-25+5y-4y+28]= 0
1/2[2x+y+3]= 0
2x+y+3 = 0
y = -2x- 3
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