Question 1143491
<pre><font size=5>
As you can see from the graph of 4x³ = 27y²,

{{{drawing(400,400,-10,10,-10,10, 
graph(400,400,-10,10,-10,10,sqrt(4x^3/27)), 
graph(400,400,-10,10,-10,10,-sqrt(4x^3/27)) )}}}

the only line that is tangent to the curve and also
normal to the curve is the x-axis.  The x-axis has
equation y = 0 and has slope 0, which is none of
the given answers.  Is there a mistake in copying 
something?  If so tell me about it in the note form
below and I'll get back to you by email.

Edwin</pre>