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2x+3y = 11 •••(1)
3x+2y = -3 ••• (2)
(1)×2, 4x+6y = 22 ••• (1)'
(2)×3, 9x+6y = -9 ••• (2)'
(1)'-(2)', -5x = 31
x = -31/5
Masukka x = -31/5 ke (2),
3× -31/5 + 2y = -3
-93/5 + 2y = -3
2y = -3+93/5 = 78/5
y = 78/5 × 1/2 = 78/10
Himpunan jawaban (x,y) = (-31/5, 78/10 )
19. 30, 18, 24