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5x - 2y = - 11 (2)
Despejamos la primera
x = 7 - 3y (3)
Reemplazamos 3 en 2
5x - 2y = - 11
5(7 - 3y) - 2y = - 11
35 - 15y - 2y = - 11
- 17y = - 46 (*-1)
17y = 46
y = 46/17 (4)
Ahora reemplazamos (4) en (3) y te queda
x = 7 - 3y
x = 7 - 3(46/17)
x = 7 - 138/17
x = -19/17
x = -1.12