A straight line is a one-dimensional figure. It has no breadth or height. It is just an extension of a point. A straight line is an endless length which does not bend in any direction. A line has an infinite length, whereas a line segment is a portion of line bounded between two points. A line segment can be referred as the shortest distance between two points.
Straight Line DefinitionBack to Top
A line segment is defined as the shortest distance between two points. Following figure shows a straight line:
A ray is a form of straight line which is an extension of a point in one direction only. A ray is drawn below:
Equation of a Straight LineBack to Top
General Equation of a Straight Line:
and c = y intercept.
and (x1, y1) is a point lying on the line.
Straight Line ConstructionBack to Top
Step 1: Convert the equation in slope-intercept form if it is not.
Step 2: Compare it with slope-intercept form, y = mx + c, and determine the value of m and c.
Step 3: Find the rise and run. Numerator of the slope is known as rise and denominator is called run.
Step 4: Locate y intercept (the value of "c") on the graph.
Step 5: Assuming this point as center, locate rise by moving up or down on y axis according to the positive or negative sign of rise.
Step 5: Now, from this point, run left or right horizontally according to the positive or negative sign of run.
Step 6: Join point obtained by y intercept and point obtained by locating slope. The required line is obtained.
Let us take an example.
Rise = -2
Run = 3
c = 1
The following graph is obtained after locating y intercept, rise and run:
Straight Line DistanceBack to Top
Formula for distance of a straight line bounded between two points is given below: