Question

resolva as questões abaixo:
a) 4× + 7= 9
b) 7× -3 =4
c ) 3- 7× =4
me ajuda?

Answer 1

a) 4× + 7= 9
4x = 9 -7
4x = 2
x= 2/4 ( simplificando por 2)
x = 1/2

b) 7× -3 =4
7x = 4 +3
7x = 7
x= 7/7
x= 1

c ) 3- 7× =4
-7x = 4 -3
-7x = 1 . (-1)
7x = -1
x= -1/7

Bons estudos!

Answer 2

$a) 4x+7=9\\ \\ 4x=9-7\to \\ \\ 4x=2\to \\\\ x= \frac{2}{4} \to \\\\ x= \frac{1}{2}$




$b) 7x-3=4\\\\ 7x=4+3\to \\\\ 7x=7\to \\\\ x= \frac{7}{7} \to \\\\ x=1$




$c) 3-7x=4\\\\ -7x=4-3\to \\\\ -7x=1\to \\\\ x=- \frac{1}{7}$