Someone help please!!!

Can someone me do math because i am having a breakdown rn because i don’t get it

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

Which of the following vectors are orthogonal to (2,1)? check all that apply