Negative is the bottom half and positive is the top
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Positive implies above the x-axis or to the right of the y-axis; negative implies below the x-axis or to the left of the y-axis.
It is both because above the origin it is positive and below the origin it is negative
a line
Yes. Angles may be measured from the direction of the positive horizontal axis and, clockwise is negative, anticlockwise is positive.
the first coordinate goes on the X axis, either positive (To the right of the Y axis) or negative (to the left of the Y axis). The second coordinate goes on the Y axis, either positive (above the X axis) or negative (below the X axis).