Question

3) Encontre o valor de x da equação -3x + y = 14, para y = 2.
​

Answer 1

-3x + y = 14

y = 2

-3x + 2 = 14

-3x = 14 - 2

-3x = 12 . (-1)

3x = - 12

x = - 12

---

3

x = - 4

Answer 2

$\begin{bmatrix}-3x+y=14\\ y=2\end{bmatrix}\\\\\begin{bmatrix}-3x+2=14\end{bmatrix}\\\\-3x+2=14\\\\-3x+2-2=14-2\\\\-3x=12\\\\\frac{-3x}{-3}=\frac{12}{-3}\\\\x=-4\\\\x=-4,\:y=2$