Respostas

2013-09-30T10:56:40-03:00
1) 2x + 4 = 10
2x = 10 - 4
2x = 6
x = 6/2
x=3

2) 5k - 12 = 18
5k = 18 + 12
5k = 30
k = 30/5
k = 6

3) 2y - 1y + 15 = 22
y = 22 - 15
y = 7

4) 9h - 2 = 19 + 2h
9h - 2h = 19 + 2
7h = 21
h = 3

Bons estudos.
2013-09-30T11:01:11-03:00
2x   + 4 = 10
2  x = 10 - 4
2 x = 6
 x = 6/2 = 3

5k   - 12 = 18
5 k = 18 + 12
 5 k = 30
  k = 30/5  = 6

2y - 1y + 15 = 22
y = 22 - 15
y=  7

9h - 2 = 19 + 2h
9h - 2h = 19 + 2
7h = 21
h= 21/7 = 3