Question 762553
{{{ x = 3 }}} is a vertical line through (3,0 )
{{{ f(x) = x^2 - 3 }}}
{{{ f(3) = 3^2 - 3 }}}
{{{ f(3) = 9 - 3 }}}
{{{ f(3) = 6 }}}
( 3,f(3) ) = ( 3,6 )
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Here is the plot of the parabola.
I don't know how to plot the vertical line through ( 3,0 )
{{{ graph( 400, 400, -10, 10, -10, 10, x^2 - 3 ) }}}