Question

qual resultado dos produtos notaveis
x+y=5
x-y=1

5x-3y=11
4x+2y=22

Answer 1

x + y = 5
x - y = 1
----------------
2x = 6
x = 6/2
x = 3

x - y = 1
3 - y = 1
-y = 1 - 3
y = 3 - 1
y = 2

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

5x - 3y = 11 (*2)
4x + 2y = 22 (*3)
--------------------
10x - 6y = 22
12x + 6y = 66
----------------------
22x = 88
x = 88 / 22
x = 4

4x + 2y = 22
4(4) + 2y = 22
16 + 2y = 22
2y = 22 - 16
2y = 6
y = 6/2
y = 3

BONS ESTUDOS!

Answer 2

   

x+y=5
x-y=1
  2x = 6  ==> x = 3

 y = 5 - x ==> y = 5-3 ==> y = 2
=============================================
5x-3y=11(2)
4x+2y=22(3)

  
10x - 6y = 22
12x + 6y = 66
       22x = 88
           x = 4

2y = 22 -  4x ==> 2y = 22 - 4.4 ==> 2y = 22-16 ==> 2y = 6 ==> y = 3