2x-5y-9=0 dan 4x-3y+3=0 nilai x²-2xy+y² adalah

36
caranya
2x-5y=9(di kali 4)
4x-3y=-3(dikali 2)
8x-20y=36
8x-6y=-6
di eliminasikan
-14y=42
y=-3

2x-5y=9
2x+15=9
x=-3
masukkan nilai x dan y

2x-5y-9=0
2x-5y=9(dikali 2)
4x-10y=18

4x-3y+3=0
4x-3y= -3 (dikali 1)
4x-3y= -3

subtitusikan
4x-10y=18 dikurangi 4x-3y= -3
=>> -7y=21
          y= -3

2x-5y=9
2x-5.(-3)= 9
2x+15= 9
2x+15-9=0
2x+6=0
2x= -6
x= -3

x²-2xy+y²
= (-3²) -2.(-3).(-3)+(-3²)
=9-18+9
= 0