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2) 2y + y = 15
3y = 15 ---- usare esto para el método
y = 15 ÷ 3
y = 5 ----- ya hallamos Y
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4x + 5y = 3
3y = 15 +
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4x + 8y = 18
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Reemplazamos:
-> 4x + 8y = 18
4x + 8(5)= 18
4x + 40 = 18
4x = 18 - 40
4x = - 22
x = -22 ÷ 4
x = -5.5 ---- ya hallamos X
Listo ñ.ñ espero haberte ayudado. Saludos.