Respuesta:
2a + 5b = 1
2a = -5b + 1
a = 1/2 ( -5 b + 1 )
a = -5/2 b + 1/2
- ( -5/2b + 1/2 ) + b = 3
5/2 b - 1/2 + b = 3
7/2 b - 1/2 = 3
7/2 b = 7/2
b = 1
a = -5 + 1 ÷ 2
a = -2
Explicación paso a paso:
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Respuesta:
SUSTITUCIÓN
2a + 5b = 1
−a + b = 3
2a + 5b = 1
2a = -5b + 1
a = 1/2 ( -5 b + 1 )
a = -5/2 b + 1/2
- ( -5/2b + 1/2 ) + b = 3
5/2 b - 1/2 + b = 3
7/2 b - 1/2 = 3
7/2 b = 7/2
b = 1
hallando a
a = -5 + 1 ÷ 2
a = -2
c s ⇒ ( -2 ; 1 )
Explicación paso a paso: