Question

Jika diketahui 2x-3y=1 dan 2x+4y=22,maka nilai dari x+y adalah...

Answer 1

2x - 3y = 1
2x + 4y = 22  _
      -7y = -21
         y = 3
subtitusi
2x = 1 + 3y
2x = 1 + 3(3)
2x = 1 + 9
2x = 10
  x = 5
nilai x + y = 3+5 = 8

Answer 2

2x-3y=1
2x+4y=22
_________-
-7y=-21
y=3
2(3)-3y=1
6-3y=1
-3y= 1-6
-3y=-5
y= 5/3
x+y = 3 + 5/3
= 14/3