The following equations represents different curves. <br> $(a)\; x+4y =9 \qquad (b) y^2 = 8(x+3) \qquad (c)\; x^2+y^2 + 2x+3y+8=0$ <br><br> equation (a) represents

Question

$\begin{array}{1 1} (a)\; straight\;line \\ (b)\; circles \\ (c)\; parabola \\ (d)\; ellipse \end{array}$