Answer:
slope of parallel line = - 1
Explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
given the line with equation
x + y = - 4 ( subtract x from both sides )
y = - x - 4 ← in slope- intercept form
with slope m = - 1
• Parallel lines have equal slopes , then
the slope of a parallel line is - 1