Question

Resolva As equações A)2x +11 =21
b) 5x -1 =4
c)3x- 10=2
d) 2x + 10= 7

Answer 1

a) 2x + 11 = 21

2x = 21 - 11

2x = 10

x = 10/2

x = 5

2 (5) + 11 = 21

10 + 11 = 21

21 = 21

b) 5x - 1 = 4

5x = 4 + 1

5x = 5

x = 5/5

x = 1

5 (1) - 1 = 4

5 - 1 = 4

4 = 4

c) 3x - 10 = 2

3x = 2 + 10

3x = 12

x = 12/3

x = 4

3 (4) - 10 = 2

12 - 10 = 2

2 = 2

d) 2x + 10 = 7

2x = 7 - 10

2x = -3

x = -3/2

2 (-3/2) + 10 = 7

-6/2 + 10 = 7

-3 + 10 = 7

7 = 7