Question 129267
Pick a value for x, doesn't matter what, so pick something that makes the arithmetic easy.  0 is a good choice here.  Then substitute that value for x and solve what remains for y.  Then the number you picked for x is the x-coordinate of the point, and the result you got for y is the y-coordinate.


This works because a point is on a line if and only if the coordinates of that point make the equation describing the line a true statement.