Show that the line joining (2, – 5) and (– 2, 5) is perpendicular to the line joining (6, 3) and (1,1).
To Prove: The Given line is perpendicular to each other.
Proof: Let Assume the coordinate A(2, – 5) and B(– 2, 5) joining the line AB, C(6,3) and D(1,1) joining the line CD.
The concept used: The product of the slopes of lines always – 1.
The formula used: The slope of the line, m =
Now, The slope of AB =
The Slope of AB =
Now, The slope of CD =
The Slope of AB =
So, AB × CD =
AB × CD = – 1
Hence, The given Lines are perpendicular to each other.