Question

se o valor do de y for igual a -2, encontre o valor de x na equação 3y+2(3y+3)=4x-2.para y​

Answer 1

Resposta:

$3y + 2 \times (3y + 3) = 4x - 2 \\ 3 \times ( - 2) + 2 \times (3 \times ( - 2) + 3) = 4x - 2 \\ - 6 + 2 \times ( - 6 + 3) = 4x - 2 \\ - 6 + 2 \times ( - 3) = 4x - 2 \\ - 6 - 6 = 4x - 2 \\ - 12 = 4x - 2 \\ - 12 - 4x = - 2 \\ - 4x = - 2 + 12 \\ - 4x = 10 \\ - 4x \div ( - 4) = 10 \div ( - 4) \\ x = 10 \div ( - 4) \\ x = - 10 \div 4 \\ \\ x = - \frac{10}{4} \\ \\ x = - \frac{5}{2}$