It is the vertical y axis on the Cartesian plane that intercepts the horizontal x axis at 90 degrees at the origin (0, 0)
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If Y = 0 then there is no value of X such that XY = 1.
To plot a complex coordinate number, almost ignore "i". Find the real part, for example, 5, -8, pi, 0.98, the number that's not attached to the "i". Then find the imaginary part, the number attached to the i. The real part would be the x coordinate and the y would be the imaginary part. For example: (4-7i) would be plotted on x=4 and y=-7.
An ordered pair that has a negative x-coordinate and a positive y-coordinate would be plotted in the second quadrant (II). In this quadrant, the x-coordinate is negative and the y-coordinate is positive.
The 'x' coordinate of the midpoint is the average of the 'x' coordinates of the segment's ends. The 'y' coordinate of the midpoint is the average of the 'y' coordinates of the segment's ends.