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The graph of 3x + 2y = 6 meets the x-axis at point P and the y-axis at point Q. Use the graphical method to find the co-ordinates of points P and Q.
If the slope of a line is -2 and its y-intercept is -7, the equation of the line is:
2x + y + 7 = 0
2x - y + 7 = 0
2x - y - 7 = 0
2x + y - 7 = 0