Determine x so that the slope of the line through (1, 4) and (x, 2) is 2.
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Is the line x – 3y = 4 perpendicular to the line 3x – y = 7?
Is the line 3x + 2y = 5 parallel to the line x + 2y = 1?
Find the slope of the line which is parallel to x + 2y + 3 = 0.