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The answer to your question is:

Step-by-step explanation:

24.-

              y = 5x - 6

             x + 5y = 5          5y = - x - 5        y = -(1/5) x - 1

Because of the slopes "5" and "-1/5"  the lines are perpendicular.

25.-         2x + y = 10       y = -2x + 10                                 slope = -2

             -6x - 3y = 3        -3y = 6x + 3        y = -2x - 1        slope = -2

              x - 2y = 8         -2y = - x + 8         y = (1/2) x - 4   slope = 1/2

Lines a and b are parallels and perpendicular to c