exam Maths Puzzle Numerical Ability

If 3x+2y=18 solve for X in terms of Y, if 3x+2y=18 solve for Y in terms of X

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exam Other Question

I have to graph:
4x+6y=1000

3x-5y=15

y is less then or equal to 3/4x-5

15x+2y>60

-40x+30y<1200 It takes 1 hour longer to fly to St. Paul at 200 mi/h than it does to return at 250 mi/h. How far away is St. Paul?