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16-01-2017
Mathematics

contestada

Solve using elimination

10x - 5y = -20
-5x + 5y = -15

Respuesta :

doodle10 doodle10

16-01-2017

-5x + 10x + 20 = - 15
5x + 20 = - 15
5x = - 35
x = - 7

(10 x - 7) - 5y = - 20
-70 - 5y = - 20
-70 = - 20 + 5y
-50 = 5y
-10 = y

Answer x=-7 and y=-10

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