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27-11-2017
Mathematics

contestada

substitution
-2x-y=-9
5x-2y=18

Respuesta :

dannielle dannielle

07-12-2017

- 2x - y = - 9 | +9
- 2x + 9 - y = 0 | +y
9 - 2x= y

5x-2y=18
5x- 2* (9-2x) = 18
5x - 2*9 -2 *(-2x)= 18
5x - 18 + 4x = 18 | +18
9x = 18+18=36
x=36:9
x=4

y= 9 - 2*4
y=9 - 8
y= 1

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