Question

Resuelve las siguientes ecuaciones en tu cuaderno de trabajo y compruébalo
como en el ejemplo anterior:
a) 2x + 8 = 18 b) 3x - 7 = 13 c) 4x - 12 = 8 d) -5x -20 = 10
e) 8x - 40 = 0 f) - 4x + 30 = 18 g) 3x - 6 = 0 h) - 3x - 2 = 4 plisss urgente

Answer 1

Respuesta:

$2x + 8 = 18 \\\\2 x = 18 - 8\\\\2x = 10\\\\x = \frac{10}{2}\\\\x = 5$

Comprobar:

$2 ( 5 ) + 8 = 18\\\\10 + 8 = 18\\\\18 = 18$

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$3x - 7 = 13\\\\3 x = 13 + 7\\\\3 x = 20\\\\x= \frac{20}{3}$

Comprobar:

$3 ( \frac{20}{3} )- 7 = 13\\\\20 - 7 = 13\\\\13 = 13$

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$4 x - 12 = 8\\\\4 x = 8 + 12\\\\4 x = 20\\\\x = \frac{20}{4}\\\\x = 5$

Comprobar:

$4 ( 5 ) - 12 = 8\\\\20 - 12 = 8\\\\8 = 8$

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$- 5 x - 20 = 10\\\\- 5 x = 10 + 20\\\\- 5 x = 30\\\\x = \frac{30}{-5}\\\\x = -6$

Comprobar:

$- 5 ( -6 ) - 20 = 10\\\\30 - 20 = 10\\\\10 = 10$

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$8 x - 40 = 0\\\\8 x = 40\\\\x = \frac{40}{8}\\\\x = 5$

Comprobar:

$8 ( 5 ) - 40 = 0\\\\40 - 40 =0\\\\0 =0$

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$- 4 x + 30 = 18\\\\- 4 x = 18 - 30\\\\- 4 x = - 12\\\\x = \frac{-12}{-4}\\\\x = 3$

Comprobar:

$- 4 ( 3 ) + 30 = 18\\\\- 12 + 30 = 18\\\\18 = 18$

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$3 x - 6 = 0\\\\3 x = 6\\\\x = \frac{6}{3} \\\\x= 2$

Comprobar:

$3 ( 2 ) - 6 =0\\\\6 - 6 = 0\\\\0 = 0$

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$- 3x - 2 = 4\\\\- 3 x = 4 + 2\\\\- 3x = 6\\\\x = \frac{6}{-3} \\\\x = - 2$

Comprobar:

$- 3 ( - 2 ) - 2 = 4\\\\6 - 2 = 4\\\\4 = 4$

Espero sea de ayuda! Saludos!