Answer:
X=Y-8
also X=2Y
X= Y-8........... equation 1
X=2Y.............. equation 2
Substitute equation 1 into equation 2
Y-8=2Y
Y-2Y= 8
-Y×-1 =8×-1
Y= -8
then substitute Y=-8 to the equations
X=2(-8)
X=-16
X=-8-8
