If the only variable is y then a graph will be a straight line along the x axis, because for every value of x, y is the same.
If there is another variable other than y, then you can still plot that variable along the x axis.
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With great difficulty because without an equality sign it can't be considered to be an equation.
Then that part of the graph is below the x-axis.
y=x^3
x = constant.
x=constant