None. The coordinate lines between the quadrants don't belong to any of the quadrants.
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Either a point or the y-intercept.If the y-intercept is known (call it b), and, calling the slope m, the equation is y = mx + b.If a sample point (x0, y0) is known, then the equation is y - y0 = m(x - x0).
The fourth quadrant
linear (A+)
Quadrant I ( + , + ) Quadrant II ( - , + ) Quadrant III ( - , - ) Quadrant IV ( + , - )
The value of x will be negative in the bottom left quadrant (quadrant 3) and the top left quadrant (quadrant 2).