Simplifying Expressions: (4y + 5) + (7y  1)
This expression involves combining like terms to simplify it. Let's break down the process step by step:
Understanding Like Terms
Like terms are terms that have the same variables raised to the same powers. For example:
 4y and 7y are like terms because they both have the variable 'y' raised to the power of 1.
 5 and 1 are like terms because they are both constants.
Combining Like Terms

Identify like terms:
 4y and 7y
 5 and 1

Combine coefficients of like terms:
 4y + (7y) = 3y
 5 + (1) = 4

Write the simplified expression: 3y + 4
Conclusion
Therefore, the simplified form of the expression (4y + 5) + (7y  1) is 3y + 4.