This program is by Eric C. Lundgren and is used here by permission.
This program is supplied without representation or warranty of any kind. Eric C. Lundgren 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.
The program will prompt for the coefficients of the two equations of the form Ax+By=C and Dx+Ey=F, keep in mind that it will call for values out of order to keep the program short. (for example, it asks first for D and then B)
It gives X=number, then hit 'R/S' to get Y=number.
LBL T INP D INP B × INP E INP A × - 1/X INP F RCL ×B INP C RCL ×E - × STO X RCL ×A +/- RCL +C RCL ÷B STO Y VIEW X VIEW Y RTN
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