12. The velocity of sound in air is given by the equation - 201/773+1 where is the vecany in meters per sand and is the temperature in egrees Ceram. Pied the marreure when the very dannat is 30 meters per second round to the nearest degree
O
7,0810 C
O
6,5390
507°C
679

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So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

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