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In Exercises 21 - 34, solve the system by the method of substitution.$ \left\{\begin{array}{l}x^2 - y = 0\\2x + y = 0\end{array}\right. $
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In Exercises 21 - 34, solve the system by the method of substitution. $ \left\{\begin{array}{l}x - 2y = 0\\3x - y^2 = 0\end{array}\right. $
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