Question

1- Resolver as equações do 1° grau abaixo
A 5x-3=87
B 4x-18=2x+26
C 12x-7=29
D 6x÷3=2
E 5x.7=350
F 4x-18=2x+16
G 3x+15=45-3x
H 15a-13=8+8a
I 3m-16=80-2m
J 7n+27+8n=108+6n

Answer 1

A) 5x - 3 = 87

5x = 87 + 3
5x = 90
x = 90/5
x = 18
.
.
B) 4x - 18 = 2x + 26

4x - 2x = 26 + 18
2x = 44
x = 44/2
x = 22
.
.
C) 12x - 7 = 29

12x = 29 + 7
12x = 36
x = 36/12
x = 3
.
.
D) 6x ÷ 3 = 2

6x = 2.3
6x = 6
x = 6/6
x = 1
.
.
E) 5x.7 = 350

5x = 350/7
5x = 50
x = 50/5
x = 10
.
.
F) 4x - 18 = 2x + 16

4x - 2x = 16 + 18
2x = 34
x = 34/2
x = 17
.
.
G) 3x + 15 = 45 - 3x

3x + 3x = 45 - 15
6x = 30
x = 30/6
x = 5
.
.
H) 15a - 13 = 8 + 8a

15a - 8a = 8 + 13
7a = 21
a = 21/7
a = 3
.
.
I) 3m - 16 = 80 - 2m

3m + 2m = 80 + 16
5m = 96
m = 96/5
.
.
J) 7n + 27 + 8n = 108 + 6n

7n + 8n - 6n = 108 - 27
9n = 81
n = 81/9
n = 9




★Espero ter ajudado! tmj