3 years ago

-4x+y+6 -5x-y=21 solve by substitution

Mathematics

1 answer:

iren2701 [21]3 years ago

3 0

Answer:

x = 15/-9

y = -114/9

Step-by-step explanation:

-4x + y + 6

-4x + y = -6

-5x - y = 21

-4x + y = -6

-5x - y = 21

__________+

-9x = 15

x = 15/-9

-4x + y = -6 | ×5 |

-5x - y = 21 | ×4 |

-20x + 5y = -30

-20x - 4y = 84

_____________--

9y = -114

y = -114/9

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