Consider the following system of equations:10 + y = 5x + x25x + y = 1The first equation is an equation of a .

Rearrange the first equation, 10 + y = 5x + x², to get y = x² + 5x − 10. Since it includes an x² term and y is expressed as a quadratic function of x, its graph is a parabola, not a line or circle.

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