Question

Determine o valor de y sabendo que r//s//t

Answer 1

\frac{2y+4}{2y-4} = \frac{2y+10}{2y} \\ \\ \frac{2y+4}{2y-4} = \frac{y+2}{y} \\ \\ 
\frac{y+2}{y-2} = \frac{y+2}{y} \\ \\ y^{2} + 2y = (y-2).(y+2) \\ \\ 
y^{2} + 2y = y^{2} + 2y - 2y - 4 \\ \\ 2y = -4 \\ \\ y = -2