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1) 3a + 3b = 15
2) 2a - 6b = - 22
Despejo a en 1
3a + 3b = 15
3a = 15 - 3b
a = (15 - 3b)/3
Sustituyo a en 2
2a - 6b = - 22
2 (15 - 3b)/3 - 6b = - 22
(2 (- b + 5)/3 - 6b = - 22
(- 2b + 10) - 6b = - 22
- 2b + 10 - 6b = - 22
- 8b = - 22 - 10
- 8b = - 32
b = - 32/-8
b = 4
Sustituyo el valor de b en el despeje de a
a = (15 - 3b)/3
a = (15 - 3 (4)/3
a = (15 - 12)/3
a = 3/3
a = 1
Solución :
a = 1
b = 4