Question

2) Resuelve las siguientes ecuaciones y luego verifica:
a) 3x + 1 = 7
b) 2a - 2 = 1 + 3a
c) 2y + 7 = y + 15
d) n + 2n + 4 = -18n + 3​

Answer 1

Explicación paso a paso:

a) 3x + 1 = 7

+3x = +7-1

+3x = +6

+3x/+3 = +6/+3

x = +2

Comprobación

+3x + 1 = 7

+3 (+2) +1 = +7

+7

+7 = +7

b) 2a - 2 = 1 + 3a

+2a -3a = +1 +2

-1a = +3

-1a/-1 = +3/-1

a = -3

Comprobación

+2a - 2 = 1 + 3a

+2 (-3) -2 = -8

+3 (-3) +1 = -8

-8 = -8

c) 2y + 7 = y + 15

+2y -y = +15 -7

+1y = +8

+1y/+1 = +8/+1

y =+8

Comprobación

2y + 7 = y + 15

+2(+8)+7= +23

+8 +15 =+23

+23= +23

d) n + 2n + 4 = -18n + 3​

+4-3 =-18n -2n-n

+1 = -21n

+1/-21 = -21n/ -21

n  = +1/-21

Comprobación

n + 2n + 4 = -18n + 3​

-0.04 +2( -0.04) +4 = -3.85

-18 (-0.04) +3 = +3.85