Author 
Topic 

mingshum
Senior Member
USA
29 Posts 
Posted  01/08/2009 : 16:11:53

From the Official SAT Study Guide p. 398:12
x f(x) 0 a 1 24 2 b
The 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) 24 B) 36 C) 48 D) 72 E) It cannot be determined from the information given
I 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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