Question

Sabendo que x=4 resolva as equações
A) 3x+5x=■
B) 7x= ■x+16
C) 3x-■=4*(2-x)
D) 9x-24=■(x+2)
■

Answer 1

x = 4

a ) 3x + 5x = _
3(4) + 5(4) = _
12 + 20 = _
_ = 32

b) 7x = _ x + 16
7(4) = _ x + 16
28 = _x + 16
_x = 28 - 16
_x = 12
_ (4) = 12
_ = 12/4
_ = 3

c) 3x - _ = 4 (2 - 4)
3(4)  - _ = 4 (- 2)
12 - _ = - 8
- _ = - 8 - 12
- _ = - 20

d) 9x - 24 = _ (x + 2)
9(4) - 24 = _ (4 + 2)
36 - 24 = _ (6)
12 = _ (6)
12/6 = _
_ = 2