Question

Preiciso pra amanhã urgente determine o valor de X nas equações abaixo
a) -2X + 8 = 32
b) -5 x - 4 = 10
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2
c) - 7 x = 28
d) 4 x = 15
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-6
e) -8 x + 21 = 84
f) 5 (x-2) = 4 (x-1)
g) 6 ( x-2) = 5 (2x-1)
h) -6 - 5 = 10
i) -5 x = 35
j) -x + 9 = 12
k) -8x + 1 =11
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6
l) x = -12
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6



valendo 20 pontos !

Answer 1

$a) [tex] - 2x + 8 = 32 \\ - 2x = 32 - 8 \\ - 2x = 24( - 1) \\ 2x = - 24 \\ x = - 24 \div 2 \\ \times = - 12$
\\ b)
$- 5x - 4 = 10 \\ - 5x = 10 + 4 \\ - 5x = 14 \: ( - 1) \\ 5x = - 14 \\ x = - 14 \div 5$
\\ c)
$- 7x = 28 \\ - 7x = 28( - 1) \\ 7x = - 28 \\ x = - 28 \div 7 \\ x = - 4$
\\ d)
$4x = 15 \\ x = 15 \div 4$
\\ e)
$- 8x + 21 = 84 \\ - 8x = 84 - 21 \\ - 8x = 63( - 1) \\ 8x = - 63 \\ x = 63 \div 8$
\\ f)
$5(x - 2) = 4(x - 1) \\ 5x - 10 = 4x - 4 \\ 5x - 4x = - 4 + 10 \\ x = 6$[/tex]

g)
$6(x - 2) = 5(2x - 1) \\ 6x - 12 = 10x - 5 \\ 6x - 10x = - 5 + 12 \\ - 4x = 7 \\ - 4x = 7( - 1) \\ 4x = - 7 \\ x = - 7 \div 4$
h)
$- 6 - 5 = 10 \\ - 11 = 10$
i)
$- 5x = 35 \\ - 5x = 35( - 1) \\ 5x = - 35 \\ x = - 35 \div 5 \\ x = - 7$
j)
$- x + 9 = 12 \\ - x = 12 - 9 \\ - x = 3 \\ - x = 3( - 1) \\ x = - 3$
k)
$- 8x + 1 = 11 \\ - 8x = 11 - 1 \\ - 8x = 10( - 1) \\ 8x = - 10 \\ x = - 10 \div 8$
l)
$x = - 12$