book Maths Puzzle Numerical Ability

x+y=38
x=2y-25

must solve using substitution

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book Other Question

How many pounds of chocolates costing $4.60 per pound may be mixed with 6 lb of chocolates costing $5 per pound to produce a mixture that can be sold for $4.90 per pound? Question: cubed root of x squared=9
After cubing both sides, the 9 becomes 729
leaving the equation x squared=729
Please help solve for x
Any help appreciated!!
Thank you