1.) 2x+y=3 2.)x-2y=-1 if equation 1is multiplied by 2 and then the equations are added, the result is

“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 .