To rewrite the inequality \( 2x + y \leq -4 \) in slope-intercept form, which is \( y = mx + b \), we need to isolate \( y \).
Starting with the original inequality:
\[ 2x + y \leq -4 \]
Subtract \( 2x \) from both sides:
\[ y \leq -2x - 4 \]
Now, the inequality is now in slope-intercept form:
\[ y \leq -2x - 4 \]
This is the final answer.