Answer :

While adding or subtracting, the like term`s numerical coefficient are added or subtracted

(i) 7x – 9y + 3 – 3x – 5y + 8


(7– 3)x +(–9 –5)y +3+8


4x – 14y +11


(ii) 3x2 + 5xy – 4y2 + x2 – 8xy – 5y2


(3+1) x2 +( –4 –5) y2 +( 5–8) x y


4x2 – 9y2 – 3xy


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