Add
$- 3 x y^{2}, 5 x y^{2}$

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Solution

The given pairs of terms $(- 3 x y^{2}), 5 x y^{2}$ are like terms.
So, adding the numerical coefficient of each term
The sum
$= (- 3 x y^{2}) + 5 x y^{2} = 2 x y^{2} (∵ - 3 + 5 = 2)$

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Add-3xy2,5xy2

The given pairs of terms(-3xy2),5xy2 are like terms.So, adding the numerical coefficient of each termThe sum=(-3xy2)+5xy2=2xy2(∵-3+5=2)

Add
$- 3 x y^{2}, 5 x y^{2}$

The given pairs of terms $(- 3 x y^{2}), 5 x y^{2}$ are like terms.
So, adding the numerical coefficient of each term
The sum
$= (- 3 x y^{2}) + 5 x y^{2} = 2 x y^{2} (∵ - 3 + 5 = 2)$