Question 670856
the equation of the altitude from D through EF is 4x + 3y - 13 = 0 and the equation of the altitude from E through DF is 2x - y - 4 = 0. What do you call the point where these lines intersect? Find the point where these lines intersect. 
---------------
Solve each equation by "y":
y = (13-4x)/3
y = 2x-4
--------
(13-4x)/3 = 2x-4
--------
13-4x = 6x-12
10x = 25
x = 2.5
--------------
Solve for "y":
y = 2x-4
y = 2*2.5 - 4 = 1
-------
The point of intersection is (2.5 , 1)
-------------------------------------------
Cheers,
Stan H.
=========