exam Maths Puzzle Numerical Ability

-1/3x+y=1 solve for y

-1/3x+y=1 solve for x

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exam Other Question

A trench is 180 feet long and 12 feet deep,7 feet wide at the top and 4 feet at the bottom.How many cubic yards of earth have been removed? What expression raised to the fourth power is 81x12y8z16?
will it be polynomials with more than one variable