exam Maths Puzzle Numerical Ability

i suck at algebra and am new so dont laugh.....-2x+3y>9

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exam Other Question

can you help me to solve for x in terms of y and solve for y in terms of x for the following equation.
3y^2+4xy-9y^2=-1

Email - acrown1@umbc.edu
Find Σ for the following set of numbers

-1/5, 2/5, -3/5, 3/5, 4/5, 1

Which is correct: (Can you show me how to solve)

a. 1
b. 1/5
c. 4/5
d. 2