Question

O número - 3 é raiz da equação:
A] 5x + 7 = -10 - x
B] 2x + 14 = -3 - 4x
C] 8x + 19 = 2+ 2x
D] x - 20 = -2 + 7x

Answer 1

a)
5x + 7 = -10 - x
5x+x=-7-10
6x=-17
x=-17/6

B]
2x + 14 = -3 - 4x
2x+4x=-14-3
6x=-17
x=-17/6

C]
8x + 19 = 2+ 2x
8x-2x=2-19
6x=-17
x=-17/6

D]
x - 20 = -2 + 7x
x-7x=-2+20
-6x=18
x=18/-6
x=-3

R= LETRA d)

Answer 2

A)
5x+7=-10-x
5x+x=-10-7
6x=-17
x=-17/6

B)
2x+14=-3-4x
2x+4x=-14-3
6x=-17
x=-17/6

C)
8x+19=2+2x
8x-2x=19-2
6x=17
x=17/6

D)
x-20=-2+7x
x-7x=20-2
-6x=18
x=-18/6
x= -3
Intem D