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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