Question: maple implicit function

The Folium of Descartes (see the wikipedia page about this curve) is an algebraic curve defined by the equation 𝑥 ^3 + 𝑦 ^3 − 3𝑎𝑥𝑦 = 0, where 𝑎 is a constant. You will need the information on this wikipedia page in order to plot the following graphs. plot them for 𝑎 = 1,  Graph the curve with 𝑎 = 1 using the command implicitplot in the range of −3 ≤ 𝑥 ≤ 3 and −3 ≤ 𝑦 ≤ 3. (which i have already done)

However i am unable to Add a plot of the line 𝑥 + 𝑦 + 𝑎 = 0 on the same graph but dashed and with a different color (set numpoints as 10000).

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