Question

Resolva as equações:

A) 7y –1 – 4y + 5 = 2y – 12

B) 2 .(3m – 3) = 7 – 4. (m – 3)

C) 2.( x + 1) - 3. ( 2x - 5) = 6x - 3

Answer 1

Resposta:

A)7y-2y-4y=-12+1-5

y=-16

B)6m-6=7-4m+12

10m=25

m=25/10

m=5/2

m=2,5

C)2x+2-6x+15=6x-3

20=10x

20/10=x

x=2

Answer 2

Resposta:

A) y = - 16

B) m = 25/10 = 2,5

C) x = 20/10 = 2

Explicação passo-a-passo:

A) 7y –1 – 4y + 5 = 2y – 12

3y + 4 = 2y - 12

3y - 2y = - 12 - 4

y = - 16

B) 2 .(3m – 3) = 7 – 4. (m – 3)

6m - 6 = 7 - 4m + 12

6m + 4m = 7 + 12 + 6

10m = 25

m = 25/10 = 2,5

C) 2.( x + 1) - 3. ( 2x - 5) = 6x - 3

2x + 2 - 6x + 15 = 6x - 3

6x + 6x - 2x = 3 + 2 + 15

10x = 20

x = 20/10 = 2