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Math·Advanced Math·Nonlinear equations in one variable and systems of equations in two variables

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A parabola opening downward with vertex near $(5,7)$ and a horizontal line $y=6.4$ intersecting it. [cite: 1660, 1665, 1666]

The graph of a system of a linear equation and a quadratic equation is shown. A solution to the system is $(x,y)$. What is a possible value of $x$?

A

4

B

5

C

6.4

D

7