<< Graphics`ImplicitPlot`

aa = Text[FontForm["A", {"Times-Bold", 12. }], {-2, 0}]

bb = Text[FontForm["B", {"Times-Bold", 12. }], {2, 0}]

\(\(Do[
      ImplicitPlot[{
		
          \((a\^2 - 4)\)\ x\^2 + a\^2\ y\^2 == \(a\^2\) \((a\^2 - 4)\), 
          y == 7}, 
		{x, \(-3\), 3}, 
		PlotRange -> {\(-3\), 3}, 

        		AspectRatio -> Automatic, 
		PlotStyle -> RGBColor[1, 0, 0], 

        		Epilog -> {aa, bb}], 
	{a, 0.001, 2.6, 0.1}]; \)\)