Co-ordinate Geometry
The question is:
Points A and B have co-ordinates (1,5) and (-2,y) respectively.
(i) Find an expression for the gradient of the straight line joining A and B.
Point C has co-ordinates (2,-3)
The angle ABC is 90 degres
(ii) Find the possible values of y
I know the working out of both parts of the question but i don't understand why you have to use:
Gradient * Perpendicular Gradient = -1 to find the values of y.
Can someone explain this?
Points A and B have co-ordinates (1,5) and (-2,y) respectively.
(i) Find an expression for the gradient of the straight line joining A and B.
Point C has co-ordinates (2,-3)
The angle ABC is 90 degres
(ii) Find the possible values of y
I know the working out of both parts of the question but i don't understand why you have to use:
Gradient * Perpendicular Gradient = -1 to find the values of y.
Can someone explain this?
Original post by ozmo19
i don't understand why you have to use:
Gradient * Perpendicular Gradient = -1 to find the values of y.
Can someone explain this?
i don't understand why you have to use:
Gradient * Perpendicular Gradient = -1 to find the values of y.
Can someone explain this?
You don't. It's the simplest method. You can use pythagoras, and that works too.
Both give rise to the equation
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