Question

urge, doy corona

Resuelve las siguientes ecuaciones y encuentra el valor de la incógnita X
A) 4x +3 = 21 -2x
B) 3x + 3 = x + 4
C) 3(x -7) = 5(x -1) - 4x
D) 2(- x +1) = x
E) 2 - x = x - 8
F) 2( 1 +2x) = 10

Answer 1

Respuesta:

A-

$4x + 3 = 21 - 2x \\ 4x + 2x = 21 - 3 \\ 6x = 18 \\ x = 18 \div 6 \\ x = 3$

B-

$3x + 3 = x + 4 \\ 3x - x = 4 - 3 \\ 2x = 1 \\ x = 1 \div 2 \\ x = 0.5$

C-

$3(x - 7) = 5(x - 1) - 4x \\ 3x - 21 = 5x - 5 - 4x \\ 3x - 21 = x - 5 \\ 3x - x = - 5 + 21 \\ 2x = 16 \\ x = 16 \div 2 \\ x = 8$

D-

$2( - x + 1) = x \\ - 2x + 2 = x \\ 2 = x + 2x \\ 2 = 3x \\ 2 \div 3 = x \\ 0.666666667 = x$

E-

$2 - x = x - 8 \\ 2 + 8 = x + x \\ 10 = 2x \\ x = 10 \div 2 \\ x = 5$

F-

$2(1 + 2x) = 10 \\ 2 + 4x = 10 \\ 4x = 10 - 2 \\ 4x = 8 \\ x = 8 \div 4 \\ x = 2$