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The lines described by y=(5a-7) and y=1/6x are perpendicular. What is the value of a?

What value of n in the equation nx 2=6y would give a line with slope 4?

A boat is traveling at a constant speed. In 5 hours, the boat travels 130 miles. How many hours will it take the boat to travel 39 miles?

Find the value of a such that the points (3, a) and (5, 2a) lie on a line with slope m=1/3.

Mai and Juan bike up a hill. Each has a different pace. The run for Mai's pace is 21 inches, and the rise is 7 inches. The run for Juan's pace is 32 inches. What is the rise of Juan's pace? If...

Fast please.. :) Algebra word problem..