Question

find x and y
x (D-1)+Dy=5
Dx+y (D+1)=1

Answer 1

y= D(1-x) from equation 2
substitute it in first equation to get value of x

Answer 2

x(D-1) + Dy = 5
Dy = 5 - Dx - x
Putting value in second equation
Dx + Dy + y = 1
Dx + 5 - Dx - x + (5 - Dx - x)/ D = 1
solve for x
then use that value to find y

Answer 3

Thank you guys, very helpful