a = (2, - 1) and b = ( 1, 3 ). Represent a + b by using the parallelogram method. Use the Vector tool to draw the vectors, complete the parallelogram method, and draw a + b. To use the Vector tool, select the initial point and then the terminal point. + Move Vector Undo Redo x Reset 6 5 4 3 N -7 -6 -5 -4 -3 -2 -1 0 5 6 -2 -3 -4 -5 -6 Please use the head to tail method and clearly show the direction of each arrow when graphing the vector