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Determinants Are Used to Show That Three Points Lie on the Same

Question 113

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Determinants are used to show that three points lie on the same line (are collinear) . If
-The equation of a line passing through two distinct points (x1, y1) and (x2, y2) is given by xy1x2y21x3y31=0. Use the determinant to write an equation for the line passing through (6,9)  and \left|\begin{array}{lll}x & y & 1 \\x_{2} & y 2 & 1 \\x_{3} & y_{3} & 1\end{array}\right|=0 . \text { Use the determinant to write an equation for the line passing through }(-6,9) \text { and }
(8,3) ( - 8,3 ) . Express the line's equation in standard form.


A) 6x2y+54=06 x - 2 y + 54 = 0
B) 9x8y18=09 x - 8 y - 18 = 0
C) 6x+2y+54=0- 6 x + 2 y + 54 = 0
D) 3x6y72=03 x - 6 y - 72 = 0

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