Tolong bantu saya mengerjakan

a.A+B
=4x+y+2x-5y
=4x+2x+y+-5y
A+B=6x-4y
b. A-B
=4x+y-2x-5y
=4x-2x+y-5y
A-B=2x-4y
c. A+4B
=4x+y+4×2x-5y
=4x+y+8x-20y
=4x+8x+y+-20y
A+4B=12x-19y
d. 3A-2B
=3×4x+y-2×2x-5y
=12x+3y-4x-10y
3A-2B=8x-7y