Question

Calcule x, sabendo que
__ __
BC // MN.

Answer 1

AM PROPORCIONAL AB
AN PROPORCIONAL AC

AM = AN
___    ____
AB  = NC

2Y / 5Y = 10 / 10 + X

2/ 5 = 10 / 10+X
2( 10 + X) =5 *1 0
20 + 2X = 50
2X = 50 - 20
2X = 30
X = 15