Question

URGENTE!
resolva as equações

a) 5×-4 = -7+1
b) 4×-7 = 3×+1
c) 5- 2× = 3×
d) x __ (3× -1) = 2 + (× -3)

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Answer 1

Resposta:

A) x= -2/5 B) x=8 C) x=1 D) x=2/3

Explicação passo-a-passo:

A) PASSOS:

5x-4=-6

5x-4+4=-6+4

5x=-2

5x/5=-2/5

x= -2/5

B) PASSOS:

4x-7+7=3x+1+7

4x=3x+8

4x-3x=3x+8-3x

x=8

C) PASSOS:

5-2x-5=3x-5

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

-5x=-5

-5x/-5 = -5/-5

x=1

D) PASSOS:

x-(3x-1)= 2+x-3

x-(3x-1)= x+2-3

x-(3x-1)= x-1

Expandir x-(3x-1): -2x+1

-2x+1=x-1

-2x+1-1=x-1-1

-2x=x-2

-2x-x=x-2-x

-3x=-2

-3x/-3 = -2/-3

x= 2/3