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# Which system is equivalent to 5x^2+6y^2=50 7x^2+2y^2=10

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We can add, subtract, multiply, and divide an equation by anything while doing the same operation to both sides of the equation, so that we can still obtain an equivalent expression. If we multiply 7 to each term of the first equation, we can also write the polynomial in a form equivalent: 35x2 + 42y2 = 350 If we multiply -5 into the second equation, we have an equivalent expression -35x2 - 10y2 = -50