Question

18) Resolva as equações do 1ºgrau:

a) x + 5 = 12

b) y – 7 = 21

c) a + 13 = 5

d) m – 2 = 1

e) 4m – 1 = 7

f) 3m – 9 = 11

g) 2b – 6 = 15

h) 5m + 7 = 32

i) -2x = 10

j) – 7x = -63​


pfvvv me ajudem

Answer 1

a) x+5=12

x=12-5

x=7

b) y-7=21

y=21+7

y=28

c) a+13=5

a=5-13

a= -8

d) m-2=1

m=1+2

m= 3

e) 4m-1=7

4m=7+1

4m= 8

m= 8/4

m= 4

f) 3m-9=11

3m=11+9

3m=20

m=20/3

g) 2b-6=15

2b=15+6

2b= 21

b= 21/2

h) 5m+7=32

5m= 32-7

5m=25

m=25/5

m=5

i) -2x=10

x= -10/2

x= -5

j) -7x= -63

x=63/7

x=9

Answer 2

Resposta:

a)x= 7 ; b)y=28 ;  c) a=-8 ; d) m=3 e)m=2 ; f)M=20\3 ; g) b=21\2 , h)m=5 ; i) -5 j) 9

Explicação passo-a-passo:

a) x + 5 = 12  

X=12-5

X=7

b) y – 7 = 21

Y=21+7

Y=28

c) a + 13 = 5

A=5-13

A=-8          

d) m – 2 = 1

M=1+2

M=3

e) 4m – 1 = 7

M=7+1\4

M=8\4

M=2

f) 3m – 9 = 11

3M=11+9

3M=20

M=20\3

g) 2b – 6 = 15

2B=15+6

2B=21

B=21\2

h) 5m + 7 = 32

5M=32-7

5M=25

M=25\5

M=5

i) -2x = 10

X=-10\2

-5

j) – 7x = -63​

-7X=-63

X=63\7

X=9