Answering:
The equation of the line is y = -3
Step-by-step explanation:
The equation of the line passing through the points (x₁, y₁) and (x₂, y₂) is given as:

where m represents the slope and is given by the formula:

For the line passing through (1, -3) and (2, -3)
![x_1=1,\text{ y^^^^2081=-3, x^^^^2082 = 2, y^^^^2082 =-3}]()
The slope is calculated as:

y - (-3) = 0(x - 1)
y + 3 = 0
y = -3
The equation of the line is y = -3