Question

ME AJUDEM????
O numero 5 é raiz de qual equação?
a)3x-1=7
b)2x+12=24
c)8x-12=5x+3
d)6x+9=4x-7

Answer 1

$a) \\ 3x-1=7 \\ \\ 3x = 7 + 1 \\ \\ 3x = 8 \\ \\ 3x = \dfrac{8}{3}$

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$b) \\ 2x+12=24 \\ \\ 2x = 24 - 12 \\ \\ 2x = 12 \\ \\ x = \dfrac{12}{2} \\ \\ x = 6$

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$c) \\ 8x-12=5x+3 \\ \\ 8x - 5x = 3 + 12 \\ \\ 3x = 15 \\ \\ x = \dfrac{15}{3} \\ \\ x = 5$

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$d \\ )6x+9=4x-7 \\ \\ 6x - 4x = -7 - 9 \\ \\ 2x = 16 \\ \\ x = \dfrac{16}{2} \\ \\ x = 8$

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Resposta letra c) 8x-12=5x+3

Answer 2

)3x-1=7 ==> 3x = 7+1 ==> 3x = 8 ==> x = 8/3

b)2x+12=24 ==> 2x = 24 -12 ==> 2x = 12 ==> x = 12/2 ==> x = 6

c)8x-12=5x+3 ==> 8x - 5x = 3 +12 ==> 3x = 15==> x = 15/3 ==> x = 5

d)6x+9=4x-7 ==> 6x - 4x = -7 - 9 ==> 2x = - 16==> x = - 16/2 ==> x = - 8