Which system of equations is represented by this graph?

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

4x 20 is 80 but if ther machine is broken then there is none you have to redo the test