# Revision history [back]

Yes you are completely right

eqns=[(a,b,c,d)]


means exactly

a+b*x_1+c*x_2+d*x_3=0


The same is true for inequalities where = is replaced by ">=".

You can also plot the corresponding surface in R^3 with

plane3.show()


which should make clear who to interpret the equation.