− 2 3 y − 3 5 x 2 9 − 4 5 x 1 3 y Let x = 5 and y = 3. − 2 3 (3) − 3 5 (5) 2 9 − 4 5 (5) 1 3 (3) = −2 − 3 2 9 − 4 1 = −77 9 Use
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1 is linear pair with 2, 2 is linear pair with 3, 3 is linear pair with 4 and 4 is linear pair with 1.
