Question

4) Resolva as equações dadas:

a) 7x - 1 = 13

f) 3k - 7 = - k + 8

b) 6b - 5 = 7

g) 5 - 2x = 3 + x

c) 3x - 2 = - 8

h) 6x - 10 = 2x + 14

d) 3y - 5 = 2y + 9

i) 6y = 2y + 28

e) 5x + 4 = x - 16​

Answer 1

a) 7x - 1 = 13

7x = 13 + 1
7x = 14
x 14/7= 2

f) 3k - 7 = - k + 8
3k + k =7 + 8
4k = 15
K =15/4

b) 6b - 5 = 7
6b = 5+ 7
b = 12/6= 2

g) 5 -2x = 3 + x
-2x - x = 3 - 5
-3x = -2 (-1)
x = 2/3

c) 3x -2 = - 8
3x = 2-8
3x=-6
x=-6/3= -2

h) 6x -10= 2x +14=
6x -2x = 10+14
4x=24
x=24/4=6

d) 3y-5=2y+9
3y-2y=5+9
y=14

i) 6y = 2y + 28
6y -2y =28
4y =28
y28/4=7

e) 5x + 4 = x -16
5x -x = -16 -4
4x =-20
x = -20/4 = -5