Question

Resolva as equações:

a) -3x - 17 = -21 b) 2x - 8 = - 7x c) 3x + 2 = 2x - 11







d) 2x = 16 – (x + 9) e) 7.(x-1) = 2.(3x+1) f) 2/3 – x = 5x +1






g) -2x + 14 = 5x - 12 h) 4x - 5 = -6x + 15 i) 5x - 2x = 6 – 3x









j) - 5m - 7 - 2m - 2 = 0 k) -14t + 9 = -13t + 50 l) -100 + 4 - 20x = -40x

Answer 1

Resposta:

$a) -3x - 17 = -21\\-17 + 21 = 3x\\4 = 3x\\x= \frac{4}{3} \\x = 1,3$

$b)2x - 8 = - 7x \\2x + 7x = 8\\9x = 8 \\x = \frac{8}{9} \\x=0,88$

$c) 3x + 2 = 2x - 11\\3x - 2x = -11 -2\\x= -11-2 \\x= -13$

$d)2x = 16 – (x + 9)\\2x= 16-x-9\\2x+x= 16-9\\3x=7\\x=1\frac{7}{3} \\x=2,33$

$e) 7.(x-1) = 2.(3x+1)\\7x-7=6x+2\\7x-6x=2+7\\x=2+7\\x=9$

$f )2/3 – x = 5x +1\\0,6-x =5x+1\\-x-5x=1-0,6\\-6x=0,4\\x=\frac{0,4}{-6}$

Answer 2

Resposta:

A = -3x + 4

B = -5x - 8

C = 1x + 13

D = 11x - 16

E = 1x - 9

F = -6x + 1/3

G = -7x + 26

H = -2x - 20

I = 6x - 6

J = -7m - 9

K = -1t - 41

L = 20x - 96

Explicação passo a passo:

A= -3x - 17 = -21 = -3x - 17 + 21 = -3x + 4

B= 2x - 8 = 7x = 2x - 8 - 7x = -5x - 8

C= 3x + 2 = 2x - 11 = 3x + 2 - 2x + 11 = 1x + 13

D= 2x = 16 - (x + 9) = 2x - 16 + 9x = 11x - 16

E= 7.(x - 1) = 2.(3x + 1) = 7x - 7 - 6x - 2 = 1x - 9

F= 2/3 - x = 5x + 1 = 2/3 - x - 5x - 1 = -6x + 1/3

G= -2x + 14 = 5x - 12 = -2x + 14 - 5x + 12 = -7x + 26

H= 4x - 5 = 6x + 15 = 4x - 5 - 6x - 15 = -2x - 20

I = 5x - 2x = 6 - 3x = 5x - 2x - 6 + 3x = 6x - 6

J= -5m - 7 - 2m - 2 = 0 = -5m - 7 - 2m - 2 - 0 = -7m - 9

K= -14t + 9 = -13t + 50 = -14t + 9 + 13t - 50 = -1t - 41

L= -100 + 4 - 20x = -40x = -100 + 4 - 20x + 40x = 20x - 96

LEMBRANDO QUE EU FIZ OS CALCULOS NA MENTE, ENTÃO PODE TER ALGUM ERRO.