HP 35s HP 35s scientific calculator - User Guide - Page 128
Solving built-in Equation, SolveAx+By+Cz=D, Ex+Fy+Gz=H, Ix+Jy+Kz=L. If you select one of them,
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Stores 291.1 in T; solves for N. Calculates mass in grams, N × 28. Calculates density in grams per liter. Solving built-in Equation The built-in equations are: "2*2 lin. solve" (Ax+By=C, Dx+Ey=F) and "3*3 lin. Solve"(Ax+By+Cz=D, Ex+Fy+Gz=H, Ix+Jy+Kz=L). If you select one of them, the , and key will have no effect. Pressing the will request 6 variables (A to F) for the 2*2 case or 12 variables (A to L) for the 3*3 case, and use them to find x, y for a 2*2 linear equation system or x, y and z for a 3*3 linear equation system. The result will be saved in variables x, y, and z. The calculator can detect cases with infinitely many solutions or no solutions. Example: solve the x,y in simultaneous equations Keys: Display value value value value value Description: Enters equation mode. Displays the built-in equation Prompts for A. Stores 1 in A; prompts for B. Stores 2 in B; prompts for C. Stores 5 in C; prompts for D. Stores 3 in D; prompts for E. 7-6 Solving Equations