Question

Resolva as equações do 1° grau abaixo:


a)3y-8=13







b) 12x-10=5x+11






c)7x+5=68-2x









d)-2.x-3=18






e)4.x-1-2.3x+4=6







f)2.7x+2+12.x+1=2











Me ajudem please

Answer 1

Explicação passo-a-passo:

a) 3y - 8 = 13

3y = 13 +8

3y = 21

y = 21/3

y = 7

b) 12x - 10 = 5x + 11

12x -5x = 11 + 10

7x = 21

x = 21/7

x = 3

c) 7x + 5 = 68 - 2x

7x+ 2x = 68 -5

9x = 63

x = 63/9

x = 7

d) -2 * x - 3 = 18

-2x = 18 + 3

-2x = 21

-x = 21/2

x = -21/2 ou -10,5

e) 4 * x - 1 - 2 * 3x + 4 = 6

4x - 1 - 6x + 4 = 6

4x - 6x + = 6 + 1 - 4

-2x = 3

x = -3/2 ou -1,5

f) 2 * 7x + 2 + 12 * x + 1 = 2

14x + 2 + 12x + 1 = 2

14x + 12x = 2 - 2 - 1

26x = - 1

x = -1/26

Answer 2

a)
3y -8 = 13
3y = +8 +13
3y = 21
y= 21/3
y= 7.


b) 12x -10 = 5x +11
12x -5x = +10 +11
7x= 21
x= 21/7
x= 3

c) 7x +5 = 68 -2x
7x +2x = -5 +68
9x = 63
x= 63/9
x= 7.


d) -2.x -3 = 18
-2x -3 = 18
-2x = +3 +18 . (-1)
2x = -3 -18
2x = -21
x= -21/2
x= -10,5


e) 4.x -1 -2 . 3x + 4 = 6
4x -1 -6x +4 = 6
-2x = +1 -4 +6 . (-1)
2x = -1 +4 -6
2x = -3
x = 1,5.

f) 2.7x +2 +12 .x +1 = 2
9x + 2 +12x +1 = 2
21x = -2 +1 +2
21x = 1
x= 1/21.