Equation of plane given a point and contain line of intersection of 2 plane What is the equation of the plane that passes through the point $(−1, 2, 1)$ and contains the line of intersection of the planes $x + y − z = 2$ and $2x − y + 3z = 1$?

How can i find the equation of the plane?
Hint:

Consider the pencil of planes that have this line in common:

$$\lambda(x+y-z-2)+(1-\lambda)(2x-y+3z-1)=0.$$

By plugging the coordinates of the given point, you will determine $\lambda$.
First, find the line of intersection.  You know that the line of intersection is parallel to the plane.  Then, find the vector orthogonal to this line.  Use this orthogonal vector and the point given to construct the equation of the plane.