book Maths Puzzle Numerical Ability

Is the line y= -3x + 2/3 parallel to the line y= -3x+5? How do you work this problem.

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Can someone out there help me with this problem?

How do you find the least common multiple (LCM) for the following group of numbers.
12, 20, and 35. Explain if you can how you come up with your answer.
Thanks! y varies jointly with the square of z and the inverse of the cube of x. If y=10 when z=2 and x=3, find y if z=3 and x=2.