Question

Resolva as equações de 1° grau:

Help meeee​

Answer 1

a) Resposta: 10

-3(3x - 42) = 2(7x - 52)
-9x + 126 = 14x - 104
-9x - 14x = - 104 - 126
-23x = -230 . (-1)
23x = 230
x = 230/23
x = 10

b) Resposta: 1

x/2 + (1 - x/5) = 1/2 *Tira o mmc


5x + 2(x - 1) = 5 *Divide e mul.
————————
10 *Corta o 10


5x + 2(x - 1) = 5
5x + 2x - 2 = 5
5x + 2x = 5 + 2
7x = 7
x = 7/7
x = 1

c) Resposta: -3,5

(x + 3/2) + (x + 2/3) = [(-1)/2] *Tira o mmc


3(x + 3) + 2(x + 2) = 3(-1) *Divide e mul.
————————————-
6 *Corta o 6


3(x + 3) + 2(x + 2) = 3(-1)
3x + 9 + 2x + 4 = -3
3x + 2x = -3 - 9 - 4
5x = -16
x = -16/5
x = -3,5

Answer 2

a)
-3(3x-42)=2(7x-52)
-9x+126=14x-104
230=23x
x=10
b)x/2 + (1-x)/5 = 1/2
5x+2(1-x)=5
5x+2-2x=5
3x+3
x=1
c)(x+3)/2 + (x+2)/3 = -1/2
3(x+3) + 2(x+2) = -3
3x+9+2x+4=-3
5x=10
x=2