1. Parallel to y- axis and intersecting at some point on x- axis. Equations of type x = 6.

2. Parallel to x- axis and intersecting at some point on y- axis. Equations of type y = 6.

We all have been Graphing Linear Equations by converting them in their standard form. Here equation y = 5 is already in its standard form representing 'y' equals to 5 as y – intercept. So to graph such equations we need to keep slope of straight curve constant and passing through y = 5 because for every value of 'x' we will be get 'y' as 5.

This curve will be defined only in first and second quadrants. Domain of this function is defined for all values of 'x' i.e. (minus infinity, infinity) and range will include only one value of 'y' i.e. 5. Thus we get a horizontal line crossing y – axis at y = 5 and parallel to x – axis.