allegansveritatem
Full Member
- Joined
- Jan 10, 2018
- Messages
- 962
The line (-2,y) (-4,4) is perpendicular to the line (-1,-2) (4,-1). What is y?
Here is how I have been attempting to work this out: y-4/-2-(-4) x -2-(-1)/-1-4 =-1 . From this I get: y-4/2 x -1/-5= -1.
From this I get: 10 x y-4/2 x 10 x 1/5 = -1. From this I get: 5y-20 x 2 = -10. From this I get: 10y -40 = -10
From this I get 10y = 30. An From this I conclude: y =3. But that is not what I need. I need a -6. But I can't seem to get that algebraically. So.....what am I doing wrong here? I spent an hour today trying to get this by algebraic means with the same result.
Here is how I have been attempting to work this out: y-4/-2-(-4) x -2-(-1)/-1-4 =-1 . From this I get: y-4/2 x -1/-5= -1.
From this I get: 10 x y-4/2 x 10 x 1/5 = -1. From this I get: 5y-20 x 2 = -10. From this I get: 10y -40 = -10
From this I get 10y = 30. An From this I conclude: y =3. But that is not what I need. I need a -6. But I can't seem to get that algebraically. So.....what am I doing wrong here? I spent an hour today trying to get this by algebraic means with the same result.