Question

Calcule o valor das expressões:

a. - 2x + 4 = -5
b. 6x - 1 = 9
c. 5x + 7 = 2x + 13
d. 4x - 5 = 5x - 1
e. 2x + 3 = 9 - x
f. 4x + 11 = 7x + 1

Answer 1

a) -2x + 4 = -5
-2x = -5 -4
-2x = -9 . (-1)
x = 9/2

b) 6x - 1 = 9
6x = 9 + 1
6x = 10
x = 10/6 ÷ (2)
x = 5/3

c) 5x + 7 = 2x + 13
5x - 2x = 13 - 7
3x = 6
x = 6/3
x = 2

Answer 2

a)2x=9-4
2x=5
x=5/2

b)6x=9+1
6x=10
x=10/6
x=5/3

c)5x-2x=13-7
3x=6
x=6/3
x=2

d)4x-5x=-1+5
-x=4
x=-4

e4x-7x=1-11
-3x=-10
3x=10
x=10/3