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A horizontal line is one that runs left to right across the coordinate plane. It does not tilt upwards or downwards.
When we graph an equation like y = 3, we are creating a horizontal line.
This is because the y-value is the same - 3 - for all points along the line.
In other words, the line stays level as it stretches from left to right, without any slopes.
No matter what x-value you pick, the y-value will always be 3.
Horizontal lines are always parallel to the x-axis. This means they never cross the x-axis.
Examples of horizontal lines include y = -1, y = 0, y = 5, etc.

The coordinate plane is a two-dimensional space used to plot points, lines, and curves.
It consists of two perpendicular lines called the x-axis (horizontal) and y-axis (vertical), intersecting at a point called the origin (0,0).
Each point on this plane can be described as an ordered pair (x, y).
The x-value indicates the position along the horizontal axis, while the y-value indicates the position along the vertical axis.
To graph the equation y = 3, you need to use the coordinate plane.
Start by locating the y-value of 3 on the y-axis.
From this point, draw a line horizontally across the plane.
This line will intersect the y-axis at (0, 3) and will be parallel to the x-axis, extending infinitely left and right.

The y-value in an equation tells you the vertical position of a point on the coordinate plane.
Specifically, it indicates how far up or down a point is from the x-axis.
For the equation y = 3, the y-value is always 3.
This means every point on the line has the same vertical position.
Regardless of the x-value, the y-coordinate doesn't change.
Understanding the y-value helps you determine where to plot points when graphing equations.
For example, in our case, start at the y-axis. Find 3 on the y-axis.
Now, draw a horizontal line through this point to represent all possible x-values, while keeping y constant at 3.