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9x - 14y - 4 = 0 ...(2)
21x + 5y - 3 = 0 ...(3)
4x + 7y = 15 ...(1)
9x - 14y = 4 ...(2)
21x + 5y = 3 ...(3)
(1) x 2 8x + 14y = 30 ...(1)'
(2) + (1)' 17x = 34
x = 2 ...(4)
Substitusikan ke x = 2 ke (1),
8 + 7y = 15
7y = 7 (15 - 8)
y = 1
x = 2
y = 1