\(y+\frac{1}{2}y=\frac{4}{5}\\ 1y+\frac{1}{2}y=\frac{4}{5}y\\ \left(1+\frac{1}{2}\right)y=\frac{4}{5}\\ \frac{3}{2}y=\frac{4}{5}\\ y=\frac{4}{5}:\frac{3}{2}\\ y=\frac{4}{5}\times\frac{2}{3}\\ y=\frac{8}{15}\)
y + 1/2 x y =4/5
y x 2 = 4/5-1/2
y x 2 = 3/10
y= 3/10 x2
y = 6/10=3/5