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finding the equation of a perpendicular line watch
- Thread Starter
- 06-09-2015 22:45
(Original post by frostyy)
- 06-09-2015 22:53
Ok, so I fixed the quadratics to get this:
which meant that x was equal to 2 and 1/2.
Which equation do I substitute the (I assume) 1/2 into?
When x = 2, y = ?
When x = 0.5, y = ?
Well, we know that point B is (2,8) because you wrote that down already in the original picture. We can confirm this by substitution. Recall that the equations of the lines are and . Now for the check: and . So (2,8) is a point that appears on both lines indeed. Now you need to find the y coordinate when x = 0.5. And remember, it doesn't matter which equation you substitute that into because the answer should be the same.Last edited by Dingooose; 06-09-2015 at 23:02.