Question

me ajuda ; - ;

Resolva as equações do 1º grau:

Answer 1

Resposta:

$5) \: x + 9 = 13 \\ x = 1 3 - 9 \\ x = 4$

$6) \: x - 7 = 4 \\ x = 4 + 7 \\ x = 11$

$7) \: 6x = - 36 \div (6) \\ x = - 6$

$8) \: - 3x = - 27 \times ( - 1) \\ 3x = 27 \div (3) \\ x = 9$

$9) \: 4x - 3 = 17 \\ 4x = 17 + 3 \\ 4x = 20 \div (4) \\ x = 5$

$10) \: 8x = x - 56 \\ 8x - x + 5 6 = 0 \\ 7x + 56 = 0 \\ 7x = - 56 \div (7) \\ x = - 8$

$11) \: 18 - 3x = 6x \\ 18 - 3x - 6x = 0 \\ 18 - 9x = 0 \\ - 9x = - 18 \times ( - 1) \\ 9x = 18 \div (9) \\ x = 2$

$12) \: 6x - 45 = 5 - 4x \\ 6x - 45 - 5 + 4x = 0 \\ 10x - 50 = 0 \\ 10x = 50 \div (10) \\ x = 5$

$13) \: - 14 - 2x = - 2 + x \\ - 14 - 2x + 2 - x = 0 \\ - 12 - 3 x = 0 \\ - 3x = 12 \div (3) \\ - x = 4 \times ( - 1) \\ x = - 4$

$14) \: \frac{x}{5} = 8 \\ \\ x = 40$

$15) \: \frac{x}{7} = - 6 \\ \\ x = - 42$

$16) \: \frac{2x}{4} = 3 \\ \\ 2x = 12 \div (2) \\ x = 6$