exam Maths Puzzle Numerical Ability

can you please help me solve this: Place the following polynomials in the correct descending order in terms of x.

4x^3y + 3xy^4 - x^2y^3 + y^4 + 7x^4
Thank you very much!

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exam Other Question
Make a conjecture about the relationship between the original number and the final number in the following process.
Pick a number
Multiply the number by 12
Add 12 to the product
Divide the sum by 4
Subtract 3 from the quotient Solve the system of equations by graphing. Then classify the system as consistant or inconsistant, dependent or indepenent?
9x-9y=63
9y-9x=-63

Help me please with this one.