Question

Помогите с уравнениями

Answer 1

▪1

а)
$a) \: \: \: 11 + 3x = 55 + 4x \\ 3x - 4x= 55 - 11 \\ - x = 44 \: \: \: | \times ( - 1) \\ x = - 44$
б)
$- 15 - 4x = - 8x + 45 \\ 8x - 4x = 45 + 15 \\ 4x = 60 \: \: \: | \div 4\\ x = 15$
в)
$- 8x - 17 = 3x - 105 \\ 105 - 17 = 3x + 8x \\ 11x = 88 \: \: \: | \div 11 \\ x = 8$

▪2.

а)
$2(y + 3) = 21 - 3y \\ 2y + 6 = 21 - 3y \\ 2y + 3y = 21 - 6\\ 5y = 15 \: \: \: | \div 5 \\ y = 3$

б)
$(2 - c) + 3(c - 3) = - 13 \\ 2 - c + 3c - 9 = - 13 \\ 2c = - 13 + 9 - 2 \\ 2c = - 6 \: \: \: | \div 2 \\ c = - 3$

в)
$- 3(1 - 3b) - 12 = 12 \\ - 3 + 9b = 12 + 12 \\ 9b = 24 + 3 \\ 9b = 27 \: \: \: | \div 9 \\ b = 3$