book Maths Puzzle Numerical Ability

Subtract 2x-3x^2+5x^3 from 5x^3+4x-x^2

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western state is 18 yrs older than southern state. western is 2.5 times as old as southern. how old is each. choices for southerns state age 12, 14 and 18 thank you How do you solve an system by graphing. I see the problem x+y=-5 and-2x+y=1 now I need to figure out how to graph the problem so I can come up with the solution. Thank you!