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12-11-2021
Mathematics

contestada

Solve using elimination.

–4x + 9y = –18
–x − y = –11

Respuesta :

12-11-2021

To do elimination, you need to get same coefficient before the variable
Multiply (-x-y = -11) by 4
-4x + 9y = -18
-4x - 4y = -44
Now subtract
13y = 26, y = 2
Plug in y = 2 for any of the two equation
-x - 2 = -11
-x = -9, x = 9

Solution: x = 9, y = 2

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