Answer:
-1
Step-by-step explanation:
Turn into slope-intercept form.
x + y = 10
~Subtract x to both sides
y = 10 - x
~Reorder
y = -x + 10
We know that slope-intercept form is y = mx + b where m = slope and b = y-intercept. Thus, the slope is -1.
Best of Luck!
