Question

Calcule o valor de x nas equações A) 3 X + 15 = X - 9
B) 7 X - 8 = 4 X + 1

Answer 1

Resposta:

A) x = -12

B) x = 3

Explicação passo-a-passo:

A) $3x+15=x-9\\3x-x=-9-15\\2x=-24\\x=\frac{-24}{2}=-12$

B)$7x-8=4x+1\\7x-4x=1+8\\3x=9\\x=\frac{9}{3} =3$

Answer 2

3x + 15 = x - 9

3x - x = -9 - 15

2x = -26

$x = \frac{ - 2</strong><strong>4</strong><strong>}{2}$

x = -12

S = {-12}

7x - 8 = 4x + 1

7x - 4x = 9

3x = 9

$x = \frac{</strong><strong>9</strong><strong>}{3}$

x = 3

S = {3}