4/6
As there are 4 numbers on the dice and there are 6 numbers all together on a dice.
Hope this helps
X= -8/5y+16
y= -5/8x+10
you didnt say if the equation was "5x+8y=80" not sure if your adding or subtracting or adding but if your adding then this is correct :)
4 , divide the x by the y to find a constant