Combine like terms

y+9+7 (y+9)

First step: (simplify) y+9+7y+63, Second step: (combine) 8y+72

Step-by-step explanation:

y + 9 + 7 (y + 9) ... first we have to get rid of those parenthesis. we can do this by distributing the 7 thru the parenthesis.

y + 9 + 7y + 63

now lets gather our like terms ...

y + 7y = 8y

63 + 9 = 72

so we have : 8y + 72 <===