Answer:
10y + 5
Step-by-step explanation:
You need to combine the Numbers with variables, and the numbers without variables need to be combined as well. Therefore, the answer is 10y +5.
9x - y = 45....subtract 9x from both sides
-y = -9x + 45 ...multiply both sides by -1 to make y positive
y = 9x - 45 <==