Question

2. Resolva a equação encontrando o valor de “x” :

a) 5x + 3 = 4x + 9 d) 3x + 1 = x + 1

b) 3x + 7 = 2x + 1 e) 2x+ 5 – x + 8 = 0

c) 8x + 2 = 6x + 4 f) 7x -12 + 3 x = 5x + 18



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Answer 1

Resposta:

a.

$5x + 3 = 4x + 9\\5x - 4x = 9 - 3\\x = 6.$

b.

$3x + 7 = 2x + 1\\3x - 2x = 1 - 7\\x = -6$

c.

$8x + 2 = 6x + 4\\8x - 6x = 4 - 2\\2x = 2\\x = 1.$

d.

$3x + 1 = x + 1\\3x - x = 1 - 1\\2x = 0\\x = 0.$

e.

$2x + 5 -x + 8 = 0\\2x - x = - 5 - 8\\x = -13$

f.

$7x - 12 + 3x = 5x + 18\\7x + 3x - 5x = 18 + 12\\5x = 30\\x = 6.$