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More Lessons for Geometry

Math Worksheets

In this lesson, we will learn

### Equation of Line Parallel to the x-axis

**How to graph a horizontal line by using a table of values (T-table)?**

Example:

Graph a line using a table of values.

y = -4

### Equation of Line Parallel to the y-axis

**How to graph a vertical line by using a table of values?**

Example:

Graph a line using a table of values

x = 3

**How to graph horizontal and vertical lines?**

Example 1:

a) Graph y = -2.

b) The graph consists of all ordered pairs whose y-coordinate is -2.

Example 2:

a) Graph x = 3.

b) The graph consists of all ordered pairs whose x-coordinate is 3.

The graph of y = c or f(x) = c, a horizontal line, is the graph of a function. Such a function is referred to as a t function.

The graph of x = a, a vertical line is not the graph of a function.

More Lessons for Geometry

Math Worksheets

In this lesson, we will learn

- what is the equation of a horizontal line or a line parallel to the
*x*-axis. - how to graph the horizontal line using a T-table.
- what is the equation of a vertical line or a line parallel to the
*y*-axis. - how to graph the vertical line using a T-table.

A line that is parallel to the *x*-axis and has a *y*-intercept of *c*. has the equation *y* = *c*. The line is a horizontal line with a slope of 0.

Example:

Graph a line using a table of values.

y = -4

A line that is parallel to the *y*-axis and has a *x*-intercept of *a* has the equation of *x* = *a. *The line is a vertical line that has no slope and no *y*-intercept. The slope is also said to be undefined.

Example:

Graph a line using a table of values

x = 3

Example 1:

a) Graph y = -2.

b) The graph consists of all ordered pairs whose y-coordinate is -2.

Example 2:

a) Graph x = 3.

b) The graph consists of all ordered pairs whose x-coordinate is 3.

The graph of y = c or f(x) = c, a horizontal line, is the graph of a function. Such a function is referred to as a t function.

The graph of x = a, a vertical line is not the graph of a function.

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