Find the equation of the line obtained by the rotation of the line x + y − 4 = 0 by pi/4
which means the line has an angle of
relative to the positive side of the x-axis.
However, it does not go through the origin as is on the line.
The rotated line can pass through the origin, if we write the rotated line as , finding "m" and setting
Is that what you are looking for ?