Question

If (3+y)/y=7, then y=
Please help :)

Answer 1

`(3 + y)/(y) = 7 \\ \\ 3 +y = 7y \\ \\ 1y - 7y = -3 \\ \\ -6y = -3 \\ \\ y = (-3)/(-6) = (1)/(2) \\ \\ y = (1)/(2)`

Answer 2

`\frac{\big{3+y}}{\big{y}}=7\ \ \ \Rightarrow\ \ \ D:\ y \\eq 0\\\\ \frac{\big{3+y}}{\big{y}}\cdot y=7\cdot y\\\\3+y=7y\\\\y-7y=-3\\\\-6y=-3\ /:(-6)\\\\y= (3)/(6) \\\\y= (1)/(2) \ \in\ D`