The substitution property of equality states that if m< 2+m< 3=m< 5 and m< 2=25, then m< 5

Arrange the parabolas represented by the equations in increasing order with respect to the y-values of their directrixes. y = -x2 + 3x + 8 y = 2x2 + 15x + 18 y = x2 + 13x + 5 y = -2x2 + 4x + 8