We know that, The graph of the equation, x = m, where m is a constant is a straight line parallel to Y axis. And, The graph of the equation, y = m, where m is a constant is a straight line parallel to X axis Given first graph is, 2x + 1 = 0 ⇒ 2x = - 1 ⇒ x = −
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∴ 2x + 1 = 0 or x = −
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is a straight line parallel to Y axis. And, Given second graph is 3y – 9 = 0 ⇒ 3y = 9 ⇒ y = 3 ∴ 3y – 9 = 0 or y = 3 is a straight line parallel to X axis. ∴ Co-ordinate of the point of intersection of these two straight line is (−