Question

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Answer 1

а)

$5 \times (y + 2) + 10y = 100 \\ 5y + 10 + 10y = 100 \\ 15y + 10 =100 \\ 15y = 100 - 10 \\ 15y = 90 \\ y = 6$

б)

$2 \times (y + 2) + 6y = 52 \\ 2y + 4 + 6y = 52 \\ 8y + 4 = 52 \\ 8y = 52 - 4 \\ 8y = 48 \\ y = 6$