Which system is equivalent to the given system? y is equal to 9 x squared x plus y is equal to 5

From x + y = 5, solve for y to get y = 5 − x. Substituting this into y = 9x² gives 5 − x = 9x², so the equivalent system is the one stating 5 − x = 9x² and y = 5 − x.

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