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a + b/2 = 7 (2) Ecuacion
En (1): b = 1 - 3a/2
En (2): b/2 = 7 - a
b = 2(7 - a)
b = 14 - 2a
b = b: b = 1 - 3a/2 y b = 14 - 2a
1 - 3a/2 = 14 - 2a
-3a/2 + 2a = 14 - 1
-3a/2 + 2a = -3a/2 + 4a/2 = a/2
a/2 = 13
a = (2)(13)
a = 26
Ahora reemplazo en b = 14 - 2a
b = 14 - 2(26)
b = 14 - 52
b = -38
Rta: a = 26; b = -38