Question

Equações de 1° grau

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➮Resolva as equações a seguir:

a) x + 5 = 8

b) x − 4 = 3

c) x + 6 = 5

d) x − 7 = −7

e) x + 9 = −1

f) x − 39 = −79

g)10 = x + 8

h)15 = x + 20

i) 9x – 2 = 4x + 18

j) 2x – 10 + 7x + 10 = 180

k) 7y – 10 = y + 50

l) 4x – 18 + 3x = 10

m) 2x + 5 + x + 7 = 18

n) 5x – 91 = 4x – 77

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Answer 1

Olá, siga a explicação:

A)

$\sf {x+5 = 8 \Longrightarrow x = 8-5 \Longrightarrow x = 3 }$

B)

$\sf x -4 = 3 \Longrightarrow x = 3+4 \Longrightarrow x =7$

C)

$\sf x+6 = 5 \Longrightarrow x = 5-6 \Longrightarrow x = -1$

D)

$\sf x - 7 = -7 \Longrightarrow x= -7+ 7 \Longrightarrow x = 0$

E)

$\sf x + 9 = -1 \Longrightarrow x = -1-9 \Longrightarrow x =-10$

F)

$\sf x - 39 = -79 \Longrightarrow x = -79 +39 \Longrightarrow x = -40$

G)

$\sf 10 = x + 8 \Longrightarrow x = 10 - 8 \Longrightarrow x = 2$

H)

$\sf 15 = x + 20 \Longrightarrow x = 15 - 20 \Longrightarrow x = -5$

I)

$\sf 9x - 2 = 4x + 18 \Longrightarrow 9x = 4x + 20 \Longrightarrow 5x = 20 \Longrightarrow x = \dfrac{20}{5} \Longrightarrow x = 4$

J)

$\sf 2x - 10 + 7x + 10 = 180 \Longrightarrow 2x - 10 + 7x = 170 \Longrightarrow 9x = 180 \Longrightarrow x = \dfrac{180}{9} \Longrightarrow x = 20$

K)

$\sf 7y - 10 = y + 50 \Longrightarrow 7y = y+60 \Longrightarrow 6y = 60 \Longrightarrow y = \dfrac{60}{6} \Longrightarrow y =10$

L)

$\sf 4x - 18 + 3x = 10 \Longrightarrow 4x + 3x = 28 \Longrightarrow 7x = 28 \Longrightarrow x = \dfrac{28}{7} \Longrightarrow x = 4$

M)

$\sf 2x + 5 + x + 7 = 18 \Longrightarrow 2x + x +7 = 13 \Longrightarrow 3x = 6 \Longrightarrow x = \dfrac{6}{3} \Longrightarrow x = 2$

N)

$\sf 5x - 91 = 4x - 77 \Longrightarrow 5x - 4x = 14 \Longrightarrow x = 14$

• Att. MatiasHP

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