Question

a) 5x - 12=3.
b) 3x +1 = x - 3

Answer 1

Explicación paso a paso:

a)

$5 x- 12 = 3 \\ 5x = 3 + 12 \\ 5x = 15 \\ x = \frac{15}{5} = 3 \\ x = 3 \\ 5 \times 3 + 12 = 15 - 12 = 3$

b)

$3x + 1 = x - 3 \\ 3x - x = - 3 - 1 \\ 2x = - 4 \\ x = \frac{ - 4}{2} = - 2 \\ x = - 2 \\ 3 \times ( - 2) + 1 = ( - 2) - 3 \\ - 6 + 1 = - 5 \\ - 5 = - 5$

Answer 2

Respuesta:

a) 3    b) - 2

Explicación paso a paso:

5X - 12 = 3

5 X = 3 + 12

X = 15 /5 = 3

X = 3

b) 3X + 1 = X - 3

   3 X - X = - 3 - 1

   2 X = - 4

      X = - 2