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pls help me

 Mar 3, 2018
 #1
avatar+99659 
+2

Whenever we have a segment  in a triangle drawn parallel to a base.....it splits the sides proportionally

 

Thus

 

AB / BC  = AE / ED

 

25 / 15  =  7x - 40  / 18              reduce the fraction on the left

 

5 / 3   =  7x - 40 / 18         cross-multiply

 

18 * 5  =   3 [ 7x  - 40 ]      simplify

 

90  =  21x  -  120        add 120  to both sides

 

210  =  21x      divide both sides by 21

 

10  = x

 

 

cool cool cool

 Mar 3, 2018

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