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mingshum
Senior Member

USA
29 Posts

 Posted - 01/08/2009 :  16:11:53 From the Official SAT Study Guide p. 398:12x f(x)0 a1 242 bThe table above shows some values for the function f. If f is a linear function, what is the value of a + b?Multiple Choice answers:a) 24B) 36C) 48D) 72E) It cannot be determined from the information givenI have no idea how the answer C)48 was reached!!

royhaas
Moderator

USA
3059 Posts

 Posted - 01/08/2009 :  16:53:51 If it's linear, then it has a constant slope. The change in x is 1 unit, and the change in f(x) satisfies 24 - a = b - 24.

mingshum
Senior Member

USA
29 Posts

 Posted - 01/09/2009 :  19:37:36 Thank you Royhass.
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