Tolong bantu no 9 please

3p-q=2r
3(-xi+yj+3k)-(yi-j+k)=2(-3i+xj+4k)
-3xi+3yj+9k-yi+j-k=-6i+2xj+8k
(-3x-y)i + (3y+1)j + (8)k=-6i+2xj+8k

-3x-y=-6 -> -9x-3y=-18
3y+1=2x -> 2x-3y=1
eliminasi
-11x=-19
x=19/11
y=9/11