it lies in the 2nd and 4th quadrants
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I,ii
It will pass through the first (when x is positive) and third quadrants (when x is negative, y will also be negative).
Quadrants I and III, numbered from I at upper right (+, +) left and moving clockwise. The line passes through the origin (0,0).
For any polynomial equation, there must be no constant term.For equations in general there is no easy way. Substitute 0 for each of the variables and if the resulting expression is 0 then the line passes through the origin.
Not enough information has been given but in general the equation of a straight line is y = mx+b whereas m is the slope and b is the y intercept.