Question

2x+7y=17 5x+4y=2 método de sustitución

Answer 1

5x+4y=2
2x+7y=17
_______
3y - 3x = 15
x-y = 5
x+5 = y ...

Reemplazando en..

5x + 4 y =2
5x + 4(x+5) = 2

5x + 4x + 20 =2

9x = -18

x = -2
y = 3