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