Question

3 ( x +1) - 5 ( x - 3) = 10 (x - 4 )

x - y = 4
x + y = 8

2x + 3 = 8
- x + 4 = - 3

por favor me ajudem !!!!!!!!!

Answer 1

3(x + 1) - 5(x - 3) = 10(x - 4)
3x + 3 - 5x + 15 = 10x - 40
-2x + 18 = 10x - 40
-2x - 10x = -40 - 18
-12x = -58
x = 58/12
x = 29/6

======================================

x - y = 4
x + y = 8
------------------
2x = 12
x = 12/2
x = 6

x - y = 4
6 - y = 4
-y = 4 - 6
y = -4 + 6
y = 2

=======================================

2x + 3 = 8
2x = 8 - 3
2x = 5
x = 5/2

=======================================

-x + 4 = -3
-x = -3 - 4
x = 7

Answer 2

3(x + 1) - 5(x - 3) = 10 (x - 4)
3x + 3 - 5x + 15 = 10x - 40
- 2x + 18 = 10x - 40
18 + 40 = 10x + 2x
58 = 12x
12x = 58
x = 58 (:2)  =  29
      12  (:2)      6

x = 29
       6
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b)
Sistema - Método da Adição:

x - y = 4
x + y = 8 ( + )
2x     = 12
x = 12/2
x = 6

Substituir em II:

x + y = 8
6 + y = 8
y = 8 - 6
y = 2
*****************************
c)

2x + 3 = 8
2x = 8 - 3
2x = 5
x = 5/2
*************************
d)

- x + 4 = - 3
4 + 3 = x
7 = x
x = 7