Question

m) 3x = 15
n) 2x = 10
o) 3.r = -9
p) 2x - 2 = 12 - 5x
q) 3x - 13 = 8
r) 4x - 9 = 23
s) 7x - 33 = -12
t) 33+ x = 5 - 3x
u) 2x = 14
V) 7x = -21
w) 4x = -12
x) 35x = -105





alguém pode me ajudar​

Answer 1

Resposta:

m) 3x = 15

$3x = 15 \\ \\ x = \frac{15}{3} \\ \\ x = 5$

n) 2x = 10

$2x = 10 \\ \\ x = \frac{10}{2} \\ \\ x = 5$

o) 3.r = -9

$3.r = - 9 \\ 3r = - 9 \\ \\ r = - \frac{9}{3} \\ \\ r = - 3$

p) 2x - 2 = 12 - 5x

$2x - 2 - 12 + 5x = 0 \\ 7x - 14 = 0 \\ 7x = 14 \div (7) \\ x = 2$

q) 3x - 13 = 8

$3x - 13 - 8 = 0 \\ 3x - 21 = 0 \\ 3x = 21 \div (3) \\ \\ x = 7$

r) 4x - 9 = 23

$4x - 9 - 23 = 0 \\ 4x - 32 = 0 \\ 4x = 32 \div (4) \\ x = 8$

s) 7x - 33 = -12

$7x - 33 + 12 = 0 \\ 7x - 21 = 0 \\ 7x = 21 \div (7) \\ x = 3$

t) 33+ x = 5 - 3x

$33 + x - 5 + 3x = 0 \\ 6x + 28 = 0 \\ 6x = - 28 \\ \\ x = - \frac{28}{6} \div (2) \\ \\ x = - \frac{14}{3}$

u) 2x = 14

$2x = 14 \\ \\ x = \frac{14}{2} \div (2) \\ \\ x = 7$

V) 7x = -21

$7x = - 21 \\ \\ x = - \frac{21}{7} \\ \\ x = - 3$

w) 4x = -12

$4x = - 12 \\ \\ x = - \frac{12}{4} \\ \\ x = - 3$

x) 35x = -105

$35x = - 105 \\ \\ x = - \frac{105}{35} \\ \\ x = - 3$