Answer:
Undefined
Explanation:

☆ (x₁, y₁) is the first coordinate and (x₂, y₂) is the second coordinate.
Slope of the line
![=( - 4 - ( - 4))/(7 - 5) \\ =( - 4 + 4)/(2) \\ = (0)/(2) \\ (undefined)]()
Thus, the slope of the line is undefined.
(Since 2 cannot be divided by zero)
Notice that the two coordinates have the same y- coordinate of -4. This means that the line is a vertical line. Vertical lines have undefined slopes.