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b.
Dengan SPLDV, didapat:
3x-4y = -17 (x2)
2x+5y = 4 (x3)
Menjadi,
6x-8y = -34
6x+15y = 12
--Kurangi--
-23y = -46
y = 2,
3x-4y = -17
3x-8 = -17
3x = -9
x = -3
Titik potong (-3,2) bergradien -3