David wants to find the solutions of this system of equations: –4x – 7 = yx2 – 2x – 6 = yWhich statement is true?

Set the expressions for y equal: −4x − 7 = x² − 2x − 6. Rearranging gives (x + 1)² = 0, so x = −1; substituting into y = −4x − 7 gives y = −3. Thus the system has one unique real solution, (−1, −3), which is choice B.

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