Friction absorbs heat energy

happens whenever work is done

does not happen in the air

releases energy as light

are u boy or girl

Explanation:

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 The correct option is (B) (4, 9).

Step-by-step explanation:  We are given to use the elimination method to solve the following system of equations :

Multiplying equation (i) by 2, we have

Adding equations (ii) and (iii), we get

From equation (i), we again get

Thus, the required solution of the given system is (x, y) = (4, 9).

Option (B) is CORRECT.