1 files changed, 17 insertions, 0 deletions
diff --git a/ext/ply/example/BASIC/linear.bas b/ext/ply/example/BASIC/linear.bas
new file mode 100644
index 000000000..56c08220b
--- /dev/null
+++ b/ext/ply/example/BASIC/linear.bas
@@ -0,0 +1,17 @@
+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