Question

resolver del método de sustitución
$- 6a + 3b = 2 \\ - 9a + 2b = - 2$
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Answer 1

- 6a + 3b = 2 (:2)
- 3a + b = 1
b = 1 + 3a

- 9a + 2b = -2
- 9a + 2(1 + 3a) = -2
- 9a + 2 + 6a = -2
- 3a = - 4
a = 4/3

b = 1 + 3a
b = 1 + 3(4/3)
b = 5