Answer:
10y
Step-by-step explanation:
9y + y = 10y
[tex]10y[/tex]
[tex]9y + y = y(9 + 1) = y(1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1) = y \times 10 = 10y[/tex]
