Question

Me ajudem a resolver essas equações a) 7x=- 21 b) 13x=13 c) 9x= -9 d) 25x=0 e) 35x=- 105 f) 4x=1 g) 36x= 12 h) 21=3x i) 84=6x

Answer 1

a) 7x = -21
    x = -21 ÷ 7
    x = -3

b) 13x= 13
    x = 13 ÷ 13
    x = 1

c) 9x = -9
    x = -9 ÷ 9
    x = -1

d) 25x = 0
    x = 0 ÷ 25
    x = 0

e) 35x = -105
    x = -105 ÷ 35
    x = -3

f) 4x = 1
   x = 1 ÷ 4
   x = 0,25

g) 36x = 12
    x = 12 ÷ 36
    x = 0,3333...

h) 21 = 3x
    x = 21 ÷ 3
    x = 7

i) 84 = 6x
   x = 84 ÷ 6
   x = 14

Espero ter ajudado. Valeu!

Answer 2

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


b)
$13x=13 \\ \\ x= \frac{13}{13} \\ \\ x=1$

c)
$9x=-9 \\ \\ x= \frac{-9}{9} \\ \\ x=-1$


d)
$25x=0 \\ \\ x= \frac{0}{25} \\ \\ x=0$


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


f)
$4x=1 \\ \\ x= \frac{1}{4}$


g)
$36x=12 \\ \\ x= \frac{12}{36} \\ \\ x= \frac{1}{3}$


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


i)
$84=6x \\ \\ x= \frac{-84}{-6} \\ \\ x=14$