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10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Does anyone know how to do geometryme with this problem

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.