You can put this solution on YOUR website! 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.