25x 10y 20 5x cy 15 In the system of equations above c i

25x - 10y = 20 5x + cy = 15 In the system of equations above, c is a constant. If the system has no solution, what is the value of c? -12 -2 5 25

25x - 10y = 20

5x + cy = 15

if the system has no solutions this means both lines are parallel and their slopes are same

slope of 1st line is

y = 25x / 10 - 20/10

slope = 5/2

slope od 2nd line is -5/c

hence

5/2 = -5/c

c = -2

option b is correct