Consider we have given equation of a line and this line is parallel to another line which is passes through any given point and to find the required equation of line with the help of given line.
Now we explain this concept with the help of an example
Example: Find the equation of straight line passing through the point and is parallel to another given line whose equation is .
First find the slope of given line by comparing slope intercept form of a line as follows:
Compare with slope intercept form, to find the slope of line
Now slope of given line , since given line is parallel to the required line and we know that slope of parallel are the same, i.e. under the condition of parallel lines
Now slope of required is also equals to , since the required line passes through the given point . To find equation of required line using slope point form is given by
Which is the equation of straight line parallel to the line . In this calculated equation observe that the coefficients of and are same.