This program was written by Walter Gray and is used here by permission.
This program is supplied without representation or warranty of any kind. The author and The Museum of HP Calculators therefore assume no responsibility and shall have no liability, consequential or otherwise, of any kind arising from the use of this program material or any part thereof.
Step 
Instructions 
Input Data/Units 
Keys 
Output Data/Units 
1 
Enter program 

2 
Store 3 sets of x,y coords in registers 05 




x1 
STO 0 


y1 
STO 1 

x2 
STO 2 

y2 
STO 3 

x3 
STO 4 

y3 
STO 5 

4 
Store X 
X 
STO 6 

5 
Compute Y 

f PRGM R/S 
Y 
4 
For new case, go to step 2 


X1=11 Y1=121 X2=3 Y2=9 X3=2
Y3=4
X=2.5 Y=6.25 etc
LINE KEYS 00 01 RCL 1 02 RCL 0 03 RCL 2 04  05 ÷ 06 RCL 1 07 RCL 0 08 RCL 4 09  10 ÷ 11  12 STO 7 13 RCL 3 14 RCL 0 15 RCL 2 16  17 ÷ 18 STO  7 19 RCL 3 20 RCL 6 21 RCL 2 22  23 ÷ 24 STO + 7 25 RCL 5 26 RCL 0 27 RCL 4 28  29 ÷ 30 STO + 7 31 RCL 5 32 RCL 6 33 RCL 4 34  35 ÷ 36 STO  7 37 1 38 RCL 6 39 RCL 2 40  41 ÷ 42 1 43 RCL 6 44 RCL 4 45  46 ÷ 47  48 STO ÷ 7 49 RCL 7 ; Displays Y
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