Help me find the slope for these pair of points (-5,5) (5,-5)

m=y2 -y1 / x2-x1

m=-5-5 / 5-(-5)
m=-10 / 10
m= -1

slope(m) = y2 -y1 / x2-x1

y2 = -5
y1 = 5
x2 = 5
x1 = -5