Question

5. Resolva as equações:
a) 5x + 1 = 3x + 9
b) 7x - 4 = 3x + 20
c) 10x - 18 = 5x +22
d) 9x - 20 = 5x + 20​

Answer 1

Resposta:

$a) 5x + 1 = 3x + 9$

$5x-3x=9-1$

$2x=8$

$x=8/2$

$x=4$

$b) 7x - 4 = 3x + 20$

$7x-3x=20+4$

$4x=24$

$x=24/4$

$x=6$

$c) 10x - 18 = 5x +22$

$10x-5x=22+18$

$5x=40$

$x=40/5$

$x=8$

$d)9x - 20 = 5x + 20$

$9x-5x=20+20$

$4x=40$

$x=40/4$

$x=10$