Which property is illustrated by the following statement if abc=def and def=xyz then abc=xyz

Asystem of equations is given below. y= 1/2x-3 and y=-1/2 x-3which of the following statements best describes the two lines? a. they have the same slope but different y-intercepts, so they have no solution. b.they have the same slope but different y-intercepts, so they have one solution. c.they have different slopes but the same y-intercept, so they have no solution. d.they have different slopes but the same y-intercept, so they have one solution. html