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how do you graph y=-2?

Draw a straight horizonal line that passes through y = -2 on the (vertical) y axis. It should extend over the full width of the graph.

Yes, y=-2 is the equation of the line that contains all the points which have their y-coordinates as -2, such as (3,-2), (5,-2), (-4,-2), etc. Plot those. You'll see that they all lie on a horizontal line which is 2 units below the x-axis. That line is the graph.

Because it not greater or lesser than so the line will only be drawn on figure -2, on y-axis

Because it not greater or lesser than so the line will only be drawn on figure -2, on y-axis on the left side where we have the nagative numbers.

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