I) 13y+21x the coefficients of \(y\) is \(=\) .
 
II) 14x20y the coefficients of \(y\) is \(=\) .
 
III) 10y+13z4x the coefficients of \(y\) is \(=\) .
 
IV) 3z8x3y the coefficients of \(y\) is \(=\) .
 
[Note: If the answer is a negative number, insert the answer along with the negative sign].