Question 174009
it could be two lines that are parallel
:
y=5x+7 and y=5x-4
:
:
or the parabola {{{y=x^2}}} and any horizontal line below the x axis such as 
:
y=-2

red and green lines are the parallel lines
:
purple and blue are the parabola and y=-2


{{{graph(300,300,-10,10,-10,10,5x+7,5x-4,x^2,-2)}}}