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subtitusi nilai x pers 1, ke pers 2
3x + 2y = -7
3(3y + 5) + 2y = -7
9y + 15 + 2y = -7
11y = (-7) - 15
11y = -22
y = -22/11
y = -2
Masukan nilai y yang di peroleh ke pers 1 atau 2
Aku masukan ke persamaan 1)
x - 3y = 5
x - 3(-2) = 5
x - (-6) = 5
x + 6 = 5
x = 5 - 6
x = -1
Jadi nilai x = -1 dan y = -2
Yah gitu sih, coba dicek lagi