Perpendicular and parallel
Find the value of t if 2tx+5y-6=0 and 5x-4y+8=0 are perpendicular and parallel lines. What angle does each line make with the x-axis, and find the angle between the lines?
Correct answer:

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You need to know the following knowledge to solve this word math problem:
geometryalgebraplanimetricsgoniometry and trigonometryUnits of physical quantitiesGrade of the word problem
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