Question

1) Resolva as equações do primeiro grau abaixo: a) 4x + 2 = 38 b) 9x = 6x + 12 c) 5x – 1 = 3x + 11 d) 2x + 8 = x + 13 e)4.(x – 2) – 5.(2 – 3x) = 4.(2x – 6)

Answer 1

Resposta:

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Answer 2

a) $4x+2=38$

$4x=38-2$

$4x=36$

$x=\frac{36}{4}$

$x=9$

b) $9x=6x+12$

$9x-6x=12$

$3x=12$

$x=\frac{12}{3}$

$x=4$

c) $5x-1=3x+11$

$5x-3x=11+1$

$2x=12$

$x=\frac{12}{2}$

$x=6$

d) $2x+8=x+13$

$2x-x=13-8$

$x=5$

e) $4\cdot (x-2)-5\cdot(2-3x)=4\cdot(2x-6)$

$(4x-8)-(10-15x)=8x-24$

$4x-8-10+15x=8x-24$

$4x+15x-8x=8+10-24$

$11x=-6$

$x=-\frac{6}{11}$