Let's simplify the expression \( 2y - y + 7 - 1 + 3 + 7x^2 - 4y \).
- Combine like terms:
- For \( y \): \( 2y - y - 4y = (2 - 1 - 4)y = -3y \)
- For the constant terms: \( 7 - 1 + 3 = 9 \)
Putting it all together, we have:
\[ -3y + 9 + 7x^2 \]
So, the simplified expression is:
\[ 7x^2 - 3y + 9 \]