Question

(Comprueba si x = 7 es solución de estas ecuaciones.
a)x-7 = 1
C)x+ 10 - 2x = 2x – 10
b) 2x - x = 21
d)3(x + 3) = 5x – 5

Answer 1

a) x -7= 1

x = 1+7

x = 8

b) x+10-2x=2x-10

10 + 10 = 2x+2x-x

20 = 3x

20/3 = x

c) 2x-x = 21

x = 21

d) 3(x+3) = 5x-5

3x + 9 = 5x -5

9+5 = 5x-3x

14 = 2x

14/2 = x

7 = x

En la ecuación d) x=7