find the 2 equations of lines 1 and 2 as shown on the graph(the picture).. the 4 numbers on the graph are 5(top-most number on the y-axis), -5 (left number on the x-axis), 5 (right number on the x-axis), -5(bottom number on the y-axis).. I'm just saying this because the numbers on the picture are quite unclear to the eyes...