The abscissa is another name for the x (horizontal) coordinate of a point. Pronounced "ab-SISS-ah" (the 'c;' is silent). Not used very much. Most commonly, the term "x-coordinate" is used. The ordinate is another name for the y (vertical) coordinate of a point. Pronounced "ORD-inet". Not used very much. Most commonly, the term "y-coordinate" is used.
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The abscissa is another word for the first coordinate in an ordered pair.
The quadrant where a point has a negative x coordinate and a negative y coordinate is located in quadrant 3.
Oh honey, the X coordinate of the point 5 6 is simply 5. It's like asking what color the sky is during the day - it's blue, no rocket science there. So, in this case, the X coordinate is just the first number in the pair, easy peasy lemon squeezy.
Its y-coordinate is zero.
The y-coordinate would be zero. The y-coord. measures far up or down the point is vertically, so if the point is on the x-axis it has to be zero.