Identify the graph of each of the equations as one of the following conic sections. Do not sketch the graphs. $$\text{ A. straight line, B. circle, C. parabola, D. ellipse, or E. hyperbola}$$

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	1.	$\displaystyle -3x-2y = -1$
	2.	$\displaystyle x^2 + 5 x - y^2 + 2 y = 0$
	3.	$\displaystyle y^2- x^2 - x = 0$
	4.	$\displaystyle x^2 - x + y = 0$

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