Question

Determina o valor de x nas equações abaixo:
a)x + 5 = 8
b)x − 4 = 3
c)x + 6 = 5
d)x − 7 = −7
e)x + 9 = −1
f)x − 39 = −79
g)10 = x + 8
h)15 = x + 20
i) 9x – 2 = 4x + 18
j) 2x – 10 + 7x + 10 = 180
k) 7y – 10 = y + 50
l) 4x – 18 + 3x = 10
m) 2x + 5 + x + 7 = 18
n) 5x – 91 = 4x – 77

Answer 1

Resposta:

A) x+5=8

x=8-5

x=3

B) x-4= 3

x= 3+4

x= 7

C) x+6=5

x=5-6

x= -1

D) x-7=-7

x= -7+7

x=0

E) x+9=-1

x=-1-9

x= -10

F) x-39= -79

x= -79+39

x= -40

G) 10=x+8

-x=8-10 .(-1)

x= -2

H) 15=x+20

x=20-15

x=5

I) 9x-2= 4x+18

9x-4x=18+2

5x=20

x=20÷5

x=4

J) 2x-10+7x+10=180

2x+7x=180+10-10

9x=180

x=20

K) 7y-10=y+50

7y-y= 50+10

6y=60

y=60÷6

y= 10

L) 4x-18+3x=10

4x+3x=10+18

7x=28

x=4

M) 2x+5+x+7=18

2x+x=18-7-5

3x=6

x=6÷3

x=2

N) 5x-91=4x-77

5x-4x=-77+91

x= 14