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solve the system
x-0.25y=11750
-0.20x + y=10000


Sagot :

x - 0.25y = 11,750 ⇒        x - 0.25y = 11,750
-0.2x + y = 10,000 ⇒ 0.05x - 0.25y = -2,500
                                               0.95x = 14,250
                                                0.95       0.95
                                                      x = 15,000
                                          x - 0.25y = 11,750
                                 15,000 - 0.25y = 11,750
                              - 15,000              - 15,000
                                              -0.25y = -3250
                                               -0.25      -0.25
                                                      y = 13,000
                                                 (x, y) = (15,000, 13,000)