Consider the pairs of parabolas graphed below.
Select the pairs that have no points of intersection.
Consider the parabolas with equations $y=x^2$y=x2 and $y=2x^2-1$y=2x2−1.
Consider the parabolas with equations $y=x^2+1$y=x2+1 and $y=3-x^2$y=3−x2.
Consider the system of equations
$y=x^2+4x+1$y=x2+4x+1
$y=-x^2+7$y=−x2+7