April 2023 0 2 Report
16. Jika (x₁, y₁) dan (xz, y₂) adalah solusi
sistem persamaan :
x² + y² + 2x - 5y = 21
x-y+4= 0
Maka nilai x₁x₂ + y₁2 adalah...
A. -17
B. -6
C. 6
D. -19
E. -7

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