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1) 3x + 8y = 5
2) - x + y = 2
Despejo y en 2.
- x + y = 2
y = 2 + x
Sustituyo y en 1.
3x + 8y = 5
3x + 8 (2 + y)
3x + 16 + 8x = 5
11x + 16 = 5
11x = 5 - 16
11x = - 11
x = -11/11
x = - 1
Sustituyo x en el despeje de y.
y = 2 + x
y = 2 - 1
y = 1
Solución :
x = - 1
y = 1