Question

X+y=15
X-y=1

-10x+15y=10
10x-14y=12

2x+y=42
45x-y=21

Answer 1

Resposta:

Explicação passo a passo:

X+y=15

X-y=1

----------

2x+ 0=15+1

2x=16

x=16/2

 x=8

 -10x+15y=10

  10x-14y=12

   ----------------

    0 + y=10+12

       y=22

 

   2x+y=42

  45x-y=21

  --------------

  47x=63

    x=63/47