Question

The slope of diagonal AB is , _ and its equation _ is .

Answer 1

Given two points (x₁,y₁) and (x₂,y₂) the slope of the line that passes through theses points will be:
m=(y₂-y₁)/(x₂-x₁)

We have two points A(-2,-2) and B(2,-2); therefore the slope will be:
m=(-2+2)/(2+2)=0/4=0

slope-intercept form:
y=mx +b
m=slope
b=y-intercept =-2

y=0x-2
y=-2

Answer: The slope of diagonal AB is 0 and its equation is y=-2

Answer 2

Slope = Rise/Run

Given: 
Rise = 0
Run = 5

Therefore,
Slope = 0/5
          = 0
The general form of a linear equation is : 
y = mx + b

m = slope 
b = y-intercept

Given:
Slope = 0
Y-intercept = -2

Hence,
Equation is : y = -2