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Solve each system by the addition method.
-4x+7y =9
2y=-5x-22
Put the answer in (x,y) form

Sagot :

Panoyinidn
-4x + 7y = 9  ⇒ -4x + 7y = 9  ⇒     8x - 14y = -18
2y = -5x - 22 ⇒ -5x - 2y = 22 ⇒ -35x - 14y = 154
                                                               43x = -172
                                                                43       43
                                                                   x = -4
                                                        -4x + 7y = 9
                                                     -4(-4) + 7y = 9
                                                          16 + 7y = 9
                                                        - 16        - 16
                                                                  7y = -7
                                                                   7      7
                                                                    y = -1
                                                              (x, y) = (-4, -1)
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