\f8 31) y =- -x+5 32) x - 4y =0 5Find the slope of the line through each pair of points. 33) (6, -20), (~14, -10) 34) (-20,17), (19, -1) Sketch the graph of each line. 35) 2x - y = 1 36) 2x - 3y = 12 Ay Ay 6 5 4 -3 -2-1 X x 6 -5 -4 -3 -2-1\fSolve each inequality and graph its solution. 39) -7s-16 + v X 40) 8 -+> 9 8 10 11 12 16 -10 -8 +> -6 -4 -2 0 x- 2 41) S-1 n - 6 4 42) -1> 6 -4 5 6 7 8\f3 46) 15 - 2 45) V6( V2 + V3\fFind the midpoint of the line segment with the given endpoints. 49) (-3, -7), (-10, 6) 50) (9, 10), (2, 10) Solve each system by substitution. 51) 3x + 3y = -21 52) x - 4y= -14 y = 1 -7x - 2y =-22