Explain how you would solve 16/c=8. then solve the equation

16/c =8

That means 16 divided by same random number "c" makes the number 8. This also means that 8 times that random number you divided by makes 16.

Using this, you can rearrange the equation in various ways.

16/c =8

16 = c*8

c = 16/8

We only really need that last one, c = 16/8, 

16/8 = 2

c = 2

16/c=8
16/c=8/1
cross multiple
16=8c
c=16/8
c=2

First subtract 10 from both side
y^2+6y-16=0
(y+8)(y-2)=0
-8 and 2