Question 1073745
So first find X=4m+3n-2p.
X=4*(3,2)+3(2,2)-2(3,-1)=(12,8)+(6,6)-(6,-2)=(12+6-6,8+6-(-2))=(12,8+6+2)=(12,16)
So the opposite direction would just negate the coordinates
Y=-X=(-12,-16)
So to make it a unit vector divide by the magnitude,
{{{M=sqrt(12^2+16^2)=sqrt(144+256)=sqrt(400)=20}}}
Y=(-12/20,-16/20)
Y=(-3/5,-4/5)