book Maths Puzzle Numerical Ability

Solve the nonlinear system:

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

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book Other Question

what is the equation of the line passing through (0,15) perpendicular to the graph of y=-3/4x+2/3???

thanks. translate "the quotient of a number and seven is two" into an equation and solve.