4x × 2 +5y ×2 = -19 ×2 =8x +10y = -38 ①
3x ×5 - 2y × 5 = 3×5 =15x - 10y = 15 ②
②+①得
8x+15x = -23
x=-1
把x=-1代入①或②
y=-3