HP 300s Scientific Calculator - Manual (Page 71)

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       
     
   
      
       
       
   (STAT)  (Reg)
 (A) 
  (STAT)  (Reg)
 (B) 
  (STAT)  (Reg)
 (r) 
x = 3.5 → = ?
     (STAT)  (Reg)
 ( ) 
y = 15 → = ?
    (STAT)
 (Reg)  ( ) 
Command Usage Tips
The commands include in the Reg sub-menu can take a long
time to execute in logarithmic, e exponential, ab exponential,
or power regression calculation when there are a large
number of data samples.
Calculations of Equations (EQN)
Use the  key to enter the EQN mode when you want to
solve an equation. In EQN mode, you can solve simultaneous
linear equations with up to three unknowns.
yˆ
yˆ
x
x