Question

(1) 3a + 3b = 26; a + 5b = 22
10th practice set 1.1 question 2 Cha 1
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Answer 1

$3a + 3b = 26 ---(1)\\ \\ a + 5b = 22$---(2)

equation (2)×3

$3a + 3b = 26 \\ \\ 3a + 15b = 66 \\ - \: \: \: \: - \: \: \: \: \: \: -$

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$- 12b = - 40 \\ \\ b = \frac{40}{12}$