book Maths Puzzle Numerical Ability

Solve the nonlinear system:

2x^2+y^2= 6
x^2-4y^2= -15

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Word problems for me are a work in progress. Please show me a step by step approach to understanding this problem.
"Area of a rectangle." The width of a rectangle i need help with a probem i dont know how to do this kind of math i waswondering if you can help me with this problem hear it is d+4lessthanoreuqulto sign 6 need to graph and solve