What is the equation of the horizontal line that passes through the point (2, -3)?

Solution:

As stated in the problem the line is horizontal. This means that its slope is zero. 

Mathematically it means that it is a line parallel to the x-axis and passing through y = -3 as shown below as horizontal line 1.

The horizontal line 1 passing through the point (2, -3) is represented by the equation y = -3. 

There is another horizontal line 2 which is passing through the point (1,2) which also has slope zero as it is parallel to the x-axis and represented by the equation y = 2

What is the equation of the horizontal line that passes through the point (2, -3)?

Summary:

The equation of the horizontal line that passes through the point (2, -3) is y = -3