Question

fine the slope(rate of change) (7,9) (10,6)

Answer 1

9-6=3
7-10=-3 
the slope will be -1 because 3 over -3 is -1 which is like dividing 3 and -3 

Answer 2

for points (x₁,y₁) and (x₂,y₂)
slope=$\frac{y_2-y_1}{x_2-x_1}$

(x,y)
(7,9)
(10,6)

x₁=7
y₁=9
x₂=10
y₂=6


slope=$\frac{y_2-y_1}{x_2-x_1}$
slope=$\frac{6-9}{10-7}$
slope=$\frac{-3}{3}$
slope=-1