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In the diagram below, $\overline{BC}$ and $\overline{DE}$ are parallel. Find $y.$

[asy] size(250);pair B = (0,0);pair C = (3,3);pair D = (5.5,2);pair E = (7.5,4);pair F = intersectionpoint(D--C, B--E);draw(D--E--F--cycle);draw(F--B--C--cycle);label(

 Oct 19, 2020
 #1
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Triangles BCF and EDF are similar so  y/20 = 9/10

 

You can take it from here.

 Oct 19, 2020

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