Question

Resuelve y comprueba las siguientes ecuaciones.

3x 18 = 5x +4
2x=12
2x-4=6
x+ 20=77

Answer 1

3y+8=5y+4

3y-5y = 4 - 8

-2y = -4  (-1)

2y = 4

$y = \frac{4}{2}$

y = 2

Comprobación

3(2) + 8 = 5(2) + 4

6 + 8 = 10 + 4

14 = 14

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2x=12

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

x = 6

Comprobación

2(6) = 12

12 = 12

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2x-4=6

2x = 6 + 4

2x = 10

x = $\frac{10}{2}$

x = 5

Comprobación

2(5) - 4 = 6

10-4 = 6

6 = 6

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x+ 20=77  

x = 77-20

x = 57

Comprobación

57 + 20 = 77

77 = 77