Question

Resolva as equaçoes:
a)3x + 18 = x
b)10x + 8 =-12
c)35 - y =4y

Answer 1

$\mathtt{a)~3x + 18 = x} \\ \mathtt{3x - x = -18} \\ \mathtt{2x = -18} \\ \mathtt{x = 2\div (- 18)} \\ \\ \boxed{\mathtt{x = -9} } \\ \\ \mathtt{b)10x + 8 =-12} \\ \mathtt{10x = -12 - 8} \\ \mathtt{10x = -20} \\ \mathtt{x = -20 \div 10} \\ \\ \boxed{\mathtt{x = -2}} \\ \\ \mathtt{c)35 - y =4y} \\ \mathtt{-y - 4y = -35} \\ \mathtt{-5y = -35} \\ \mathtt{y = -35 \div -5} \\ \\ \boxed{\mathtt{y = 7}}$

Answer 2

Olá, boa noite ☺

Resoluções:

a)

3x + 18 = x
3x -x = - 18
2x= -18
x= -18/2
x= -9

b)

10x + 8 = -12
10x = -12 - 8
10x=-20
x=-20/10
x= -2

c)

35 - y = 4y
-y - 4y = -35
-5y= -35
5y= 35
y=35/5
y= 7

Bons estudos :)