Question

Resolva as equações:

a) 11x +7 = -6
b) 3x +1 = 19
c) 5 + 2x = 1
d) 2x – 3 = 17
e) 7x +1 = 5x -7
f) 5x – 91 = 4x -77
g) 5 + 3y = - 1 + 4y

Answer 1

a) 11x +7 = - 6

$11x = - 6 - 7 \\ x = \frac{ - 13}{11} \\ x = - 1.18$

b) 3x +1 = 19

$3x = 19 - 1 \\ x = \frac{18}{3} \\ x = 6$

c) 5 + 2x = 1

$2x = 1 - 5 \\ x = \frac{ - 4}{2} \\ x = - 2$

d) 2x – 3 = 17

$2x = 17 + 3 \\ x = \frac{20}{2} \\ x = 10$

e) 7x + 1 = 5x - 7

$7x + 1 = 5x - 7 \\ 7x - 5x = - 7 - 1 \\ x = \frac{ - 8}{2} \\ x = - 4$

f) 5x – 91 = 4x - 77

$5x - 91 = 4x - 77 \\ 5x - 4x = 91 - 77 \\ x = 14$

g) 5 + 3y = - 1 + 4y

$5 + 3y = - 1 + 4y \\ y = 6$