Lines drawn parallel to the axes have only one letter.
y=5 is horizontal, parallel to the x-axis
x=5 is vertical , parallel to the y-axis.
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When you graph lines or points, the cross drawn behind them, labeled with numbers and units, are the axes. The horizontal line is the x-axis, and the vertical the y-axis.
Yes and the straight line could be parallel to the x or y axes
It has axes.
The variables that you are plotting on the graph!
When the slope of a line reaches zero it then will be parallel to the x or y axes depending if its a positive or a negative slope.