August 2018 1 70 Report
Jika (x₁,y) dan (x,y) adalah penyelesaian sistem persamaan x²+y²+2x-5y=21 dan x-y+4=0, maka nilai x.x+ y.y adalah....

a. -7
b. -1
c. 6
d. -6
e. -19

Mohon bantuannya ya.. :)

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