Question

resolva cada sistema: (x+y=23) (2x+3y=51)

Answer 1

x+y=23 -> x=23-y
2x+3y=51

2(23-y)+3y=51
46-2y+3y= 51
y= 51-46
y= 5


x= 23-y
x= 23-5
x= 18



Espero ter ajudado! ;)

Answer 2

x+y=23(-2)
2x+3y=51

-2x-2y= - 46
2x+3y=51  
      y = 5

x+y=23

x = 23 - y  ==> x = 23 -5 ==> x = 18