book Maths Puzzle Numerical Ability

The angular velocity of a merry-go-round is 35 radians/minute. If the diameter is 38 feet, find the linear velocity of a person standing on the very edge of the merry-go-round.

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find the slope intercept of the equation of the line that is parallel to the graph 3x +4y=8 and passes through (2,11). Hi.
I have a question about solving linear equations. How would you solve X+Y=4? If you can help me solve just that one, then Ill know how to do the rest.
Thanks Alot
Sara