Question

Resolva as seguintes equações:
A)5x+3=4x+9
B)3y+7=2y+1
C)8n+2=6n+8
D)3x+1=x+1

Answer 1

a)

$5x + 3 = 4x + 9 \\ 5x - 4x = 9 - 3 \\ x = 6$

b)

$3y + 7 = 2y + 1 \\ 3y - 2y = 1 - 7 \\ y = - 6$

c)

$8n + 2 = 6n + 8 \\ 8n - 6n = 8 - 2 \\ 2n = 6 \\ n = \frac{6}{2} \\ n = 3$

d)

$3x + 1 = x + 1 \\ 3x - x = 1 - 1 \\ 2x = 0 \\ x = \frac{0}{2} \\ x = 0$