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3x = -4 - 2y
x = - 4/3 - 2/3y
sustituyendo
4x + 9y = 1
4 (-4/3 - 2/3y) + 9y = 1
- 16/3 - 8/3y + 9y = 1
19 / 3 y = 19/3
Y = 1
reemplazando
x = -4/3 - 2/3 (1) = -6/3 = -2 sol ( -2:1)