Question

na figura ,r//s//t. Determine a medida do segmento AB.

Answer 1

2x+1 / 5x-1  =  4/6
4(5x-1) = 6(2x+1)
20x-4 = 12x+6
20x-12x = 6+4
8x = 10
x = 10/8
x = 5/4

AB = 2x+1
AB = 2(5/4) + 1
AB = 10/4 + 1 
AB = 10/4 + 4/4
AB = 14/4
AB = 7/2