Question

Resolver as seguintes equações na incógnita x:
(a) 5x + 10 = 13
(b) 4x − 12 = 7
(c) 6 + 4x = −3
(d) 2 − x = 1
(e) 5 = 4 − 4x

Answer 1

(a) 5x + 10 = 13

5x = 13 - 10

5x= 3

x= 3/5

(b) 4x − 12 = 7

4x= 7 + 12

4x= 19

x= 19/4

(c) 6 + 4x = −3

4x = - 3 - 6

4x= - 9

x= - 9/4

(d) 2 − x = 1

- x = 1 - 2

- x = - 1(-1)

x= 1

(e) 5 = 4 − 4x

4x = 4 - 5

4x = - 1

x= - 1/4