Question

RESOLVA AS EQUAÇÕES:

A) ×+ 3= 7

B) 2× - 5= x + 4

C) 9- 4x - 4= x +7 - 1

D) 16× 5- 3= 2×-15

E) -x +40=4x

F) 4x - 12= x + 18​

Answer 1

Resposta:

A) ×+ 3= 7

$x + 3 - 7 = 0 \\ x - 4 = 0 \\ x = 4$

B) 2× - 5= x + 4

$2x - 5 - x - 4 = 0 \\ x - 9 = 0 \\ x = 9$

C) 9- 4x - 4= x +7 - 1

$9 - 4x - 4 - x - 7 + 1 = 0 \\ - 5x - 1 = 0 \\ - 5x = 1 \times ( - 1) \\ 5x = - 1 \\ \\ x = - \frac{1}{5}$

D) 16× 5- 3= 2×-15

$16x + 5 - 3 - 2x + 15 = 0 \\ 14x + 17 = 0 \\ 14x = - 17 \\ \\ x = - \frac{17}{14}$

E) -x +40=4x

$- x + 40 - 4x = 0 \\ - 5x + 40 = 0 \\ - 5x = - 40 \times ( - 1) \\ 5x = 40 \div (5) \\ x = 8$

F) 4x - 12= x + 18

$4x - 12 - x - 18 = 0 \\ 3x - 30 = 0 \\ 3x = 30 \div (3) \\ x = 10$