Cara ngerjain Soal nomer 19 kak..

smoga membantush_!

#jwbnnya ad dipict

1/2x + 3y = 11
1/2x + 3(3/4x -11/2) = 11
1/2x + 9/4x - 33/2 = 11
1/2x + 9/4x = 11 + 33/2
11/4x = 55/2
x = 55/2 x 4/11 = 10
y = 3/4x - 11/2
= 3/4.10 - 11/2
= 15/2 - 11/2 = 4/2 = 2
x + y = 10 + 2 = 12