3) 2x + 3y = 9 1 x = 2y + 1 2 2 Ganti dalam 1 Ganti y = 1 dalam 2 2( ) + 3y = 9 x= 2( ) + 1 2 (2y + 1) + 3y = 9 X =2(1) + 1 4y + 2 + 3y = 9 X = 2 + 1 4y+3y = 9 – 2 X = 3 7y = 7 y = 7 7 Maka titik persilangan (3, 1) y = 1