book Maths Puzzle Numerical Ability

Please solve each system by graphing. Please help me solve the following problem.

1. y = 2/3x
x = y + 3

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The speed of an Amtrak passenger train is 14 mph faster than the speed of a Central Railway freight train. The passenger train travels 400 miles in the same time it takes the freig The problem is 3 cube root x^3y^13 + 4xy cube root 8y^10. It states simplify the radical expression and assume that all variables represet positive real numbers. I have come up wit