I'm trying to plot this equation, if anyone can help

y² = 4ax

Answer 1

[Star Strider]

Take the square root of both sides, and plot:

y = +sqrt(4*a*x);
y = -sqrt(4*a*x);

That’s how I would do it, anyway.

Answer 2

[John D'Errico]

If no value is supplied for a, then what will you plot?

Perhaps you might do this:

a = 0.25:0.25:2;
L = cell(size(a));
for ind = 1:numel(a)
    ai = a(ind);
    fun = @(x,y) y.^2 - 4*ai*x;
    fimplicit(fun,[0,10,-10,10])
    hold on
    L{ind} = ['a = ',num2str(ai)];
end
legend(L{:},'location','northwest')