The equation you've provided is in the form of \( y = mx + b \), where \( m \) represents the slope and \( b \) is the y-intercept.
The equation you provided is:
\[ y = -3x + 4 \]
From this equation, we can identify the slope \( m \):
- The slope \( m \) is \(-3\).
Thus, the correct answer is:
\(-3\)