book Maths Puzzle Numerical Ability

when i am trying to get a line that is parallel to a line that is going through a set of given points, when do i use the rule that tells me to use opposite sign and flip the number upside down in my equation?

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book Other Question
Student rides bicycle to repair shop and walks home. Student averages 12mph riding to the shop and 3mph walking home. The round trip took 1 hour. How far is it between the student' A top spins 200 revolutions/minute. Find the angular velocity in radians/second.