Question 156855
 how do i graph the circle, x^2 + 4y^2 =1
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That's an ellipse.
To graph either, or any curve, you plot a number of points and then connect them with smooth lines.
To find the points, solve for one variable in terms of the other.  In this case:
x = sqrt(1 - 4y^2)
You can use Excel to find any # of points, and to make the graph.