Question

Resolva as seguintes equações de 1° grau:

a)
$3x + x = 16$

b)
$15x - 2x = 26$

c)
$70 = 140x$

d)
$21x = 42$

e)
$150x = 450$

f)
$x - 3x = - 16$

g)
$2x - 4x = - 18$

h)
$3x - 6x = - 27$
​

Answer 1

Resposta:

A-

$3x + x = 16 \\ 4x = 16 \\ x = \frac{16}{4} \\ x = 4$

B-

$15x - 2x = 26 \\ 13x = 26 \\ x = \frac{26}{13} \\ x = 2$

C-

$70 = 140x \\140x = 70 \\ x = \frac{70}{140} \\ x = \frac{1}{2}$

D-

$21x = 42 \\ x = \frac{42}{21} \\ x = 2$

E-

$150x = 450 \\ x = \frac{450}{150} \\ x = 3$

F-

$x - 3x = - 16 \\ - 2x = - 16 \: \: \: \: \: \: \:( - 1) \\ 2x = 16 \\ x = \frac{16}{2} \\ x = 8$

G-

$2x - 4x = - 18 \\ - 2x = - 18 \: \: \: \: \: ( - 1) \\ 2x = 18 \\ x = \frac{18}{2} \\ x = 9$

H-

$3x - 6x = - 27 \\ - 3x = - 27 \: \: \: \: ( - 1) \\ 3x = 27 \\ x = \frac{27}{3} \\ x = 9$