| 1 REM ::: SOLVE A SYSTEM OF LINEAR EQUATIONS | |
| 2 REM ::: A1*X1 + A2*X2 = B1 | |
| 3 REM ::: A3*X1 + A4*X2 = B2 | |
| 4 REM -------------------------------------- | |
| 10 READ A1, A2, A3, A4 | |
| 15 LET D = A1 * A4 - A3 * A2 | |
| 20 IF D = 0 THEN 65 | |
| 30 READ B1, B2 | |
| 37 LET X1 = (B1*A4 - B2*A2) / D | |
| 42 LET X2 = (A1*B2 - A3*B1) / D | |
| 55 PRINT X1, X2 | |
| 60 GOTO 30 | |
| 65 PRINT "NO UNIQUE SOLUTION" | |
| 70 DATA 1, 2, 4 | |
| 80 DATA 2, -7, 5 | |
| 85 DATA 1, 3, 4, -7 | |
| 90 END |