How do you find equivalent ratios? (Please put explanation)

Two ratios that are equivalent are the same in value. We call these equivalent ratios. To find an equivalent ratio multiply or divide both of the numbers by a common number (or same number), this would be the exact same when finding equivalent fractions as well.

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