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Straight lines join two points on a coordinate grid and continue past those points infinitely. There are two types of basic straight line graphs: horizontal, and vertical, each recognisable from their equation.
| -INTERCEPT | The point on the -axis where the line crosses through. |
| -INTERCEPT | The point on the -axis where the line crosses through. |
| HORIZONTAL | A straight line going left to right. Think of the "horizon" to help you remember. |
| VERTICAL | A straight line going up and down. |
The equation of a horizontal line is
where is the -intercept. A vertical line has equation
where is the -intercept.
To draw either a horizontal or a vertical line using its equation follow this procedure:
1. | Decide whether the equation is for a horizontal line () or a vertical line (). |
2a. | If horizontal, draw a horizontal line that passes through the point . |
2b. | If vertical, draw a vertical line that passes through the point . |
Note: Every point on a horizontal line has the same -coordinate and every point on a vertical line has the same -coordinate.
Draw the lines and .
The line is horizontal and passes through the point . The line is vertical and passes through .
Horizontal goes between left and right. Think of the "horizon" to help you remember. Vertical goes between up and down.
A vertical line has equation x=d where d is the x-intercept.
The equation of a horizontal line is y=c where c is the y-intercept.
Beta
