Answer: To write the equation of a line parallel to AB through a given point, we need to follow these steps:
Find the slope of the line AB. The slope of a line passing through two points (x1, y1) and (x2, y2) is given by the formula:
m = (y2 - y1)/(x2 - x1)
Let the coordinates of points A and B be (x1, y1) and (x2, y2) respectively. Then, the slope of the line AB is:
m = (y2 - y1)/(x2 - x1)
Since we want to find the equation of a line parallel to AB, the slope of this line will also be equal to m.
Let the given point be (x0, y0). Using the point-slope form of the equation of a line, we can write the equation of the line passing through (x0, y0) with slope m as:
y - y0 = m(x - x0)
Substituting the value of m found in step 1, we get:
y - y0 = (y2 - y1)/(x2 - x1) * (x - x0)
This is the equation of the line parallel to AB passing through the point (x0, y0).
Note that we assume that the line passing through A and B exists and is not vertical. If the line is vertical, then its slope is undefined, and we cannot find the equation of a parallel line using this method. In that case, we need to use a different method to find the equation of the line.
Explanation: