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x + 2y = 8
- x + 3y = 17
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5y = 25
y = 25/5
y = 5
Sustituimos "x" en la primera ecuación.
x + 2y = 8
x + 2(5) = 8
x + 10 = 8
x = 8 - 10
x = - 2
Solución.
x =- 2
y = 5