Question

Atividade de matematica
1- resolva as equações do 1 grau com uma encogneta

a)7x-3=2x+4 b)5x=3x-8
c)4m-8=2m d)3x+7=21
e)2b-8=22 f)5x+3-x=2x-9
g)10g+4=5y+3-5+2y h)m-2+7m=14
i)7x-19+4=2x j)3x-5=2x+5​

Answer 1

a)7x-3 = 2x+4

7x-2x = 4+3

5x = 7

x = 7/5

x = 1.4

b)5x = 3x-8

5x-3x = -8

2x = -8

x = -8/2

x = -4

c)4m-8=2m

4m-2m = 8

2m = 8

m = 8/2

m = 4

d)3x+7=21

3x = 21-7

x = 14/3

x = 4.66

e)2b-8=22

2b = 22 + 8

b = 30/2

b = 15

f)5x+3-x = 2x-9

5x-x-2x = -9-3

2x = -12

x = -12/2

x = -6

**g)10y+4=5y+3-5+2y

10y-5y-2y = 3-5-4

3y = -6

y = -6/3

y = -2

h)m-2+7m=14

m+7m = 14+2

8m = 16

m = 16/8

m = 2

i)7x-19+4=2x

7x-2x = 19-4

5x = 15

x = 15/5

x = 3

j)3x-5=2x+5​

3x-2x = 5+5

x = 10