Hi, i have attached a graph i made. Sorry for the sloppy graph cuz it was my first time using the software, and don't mind the little box in the top right hand corner. I don't get how to get rid of it. Also the red line with the two set of points in line L

Here's the question:

The figure shows line L in the xy-coordinate plane. Line m (not shown) is obtained by horizontally translating each point on line L 2 units to the left. if the equation of m is (4/5)x+k. what value is k?