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Problem 1. Find the equation of the line passing through the point (1,1) and perpendicular to the line 2x +3y = 5.
Problem 2. Find the equation of the line passing through the point (2,3) and perpendicular to the line y = −2x +3.
Problem 3. Find the equation of the line passing through the point (3,4) and perpendicular to the line 7x −2y = 1.
Problem 4. Find the equation of the line passing through the points (2,1) and (−1,3).