Question

Faça as seguintes equações

a)-9x + 8 = -43
b)0=11x -4
c)-4 = 2-3x
d)4=2x + 4

Answer 1

a)
- 9x + 8 = - 43
8 + 43 = 9x
51 = 9x
9x = 51
x =  51
      ------
        9

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
0 = 11x - 4
4 = 11x
11x = 4
 x =   4
        -----
         11

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
- 4 = 2 - 3x
3x = 2 + 4
3x = 6
x = 6/3
x = 2


¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
d)
4 = 2x + 4
4 - 4 = 2x
0 = 2x
2x = 0
x = 0/2
x = 0

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨

Answer 2

a)-9x+8=-43
    -9x=-43-8
     -9x=51
    x=51/9=5,666...

b) 0=11x-4
    0+4=-11x
     4=-11x
        11/4=2.705

c)-4=2-3x
   -4-2=-3x
     6=-3x
     x= 6/3=-2

d)4=2x+4
   4-4=2x
   0=2x
x=0/2=0