Question 98625
y = x^2 version is a vertical parabola.
x = y^2 version is a horizontal parabola
For: y = ax^2 or x = ay^2
a is negative ... the parabola goes left or down
a is positive ... the parabola goes right or up
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Graph (b) describes a horizontal parabola going left
{{{graph(300,300,-5,5,-5,5,1+sqrt(-x),1-sqrt(-x))}}}