Question

Qual é o número que colocado no lugar de x. torna verdad me?
a) x + 9 = 13
b) X- 7 = 10
c) 5x - 1-9
d) x - 3=8​

Answer 1

Resposta:

$a) x+9=13\\\\x+9-9=0\\\\x=13-9\\\\x=4$

$b)x-7=10\\\\x-7+7=0\\\\x=10+7\\\\x=17$

$c)5x-1-9\\\\5x-1+1=0\\\\5x=9+1\\\\5x=10\\\\x=10:5\\\\x=2$

$d)x-3=8\\\\x-3+3=0\\\\x=8+3\\\\x=11$