You will need
- Knowledge of analytic geometry. Basic knowledge in algebra.
Instruction
1
The equation of the line is given by the coordinates of two points on the plane through which this line must pass. Make a ratio of the coordinates of these points. Let the first point has coordinates (x1,y1) and the second (x2,y2), then the equation of the line is given by: (x-x1)/(x2-x1) = (y-y1)(y2-y1).
2
Convert the resulting equation of the line and explicitly Express y through x. After this operation, the equation of the line will take its final form: y=(x-x1)/((x2-x1)*(y2-y1))+y1.
Note
If one of the numbers in the denominator equal to zero means that there is a direct parallel to one of the coordinate axes.
Useful advice
After you have compiled the equation of a line, check that it is correct. To do this, substitute the coordinates of the points instead of the corresponding coordinate and verify the validity of the equation.
