A3. For which value of the parameter $m$ will the lines with equations $y=(m+5) x+m-1$ and $y=(m-1)^{2} x-3 m$ be parallel?
(A) $m_{1}=1, m_{2}=-5$
(B) $m_{1}=-4, m_{2}=1$
(C) $m_{1}=1, m_{2}=\frac{1}{3}$
(D) $m=-\frac{1}{4}$
(E) none of the above
A3. The lines are parallel if they have the same coefficient, so $m+5=(m-1)^{2}$, from which it follows that $(m-4)(m+1)=0$. The solutions are $m_{1}=4$ and $m_{2}=-1$, so the correct answer is (E).