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6×8y=20
48y=20
y=20÷48
y=20 es una fraccion
12
y=5
12
6x+8y=20--------*5
3x+5y=8---------*-8
30x+40y=100 (se eliminan los "40y" porq son de diferentes
-24x-40y=-64 signos)
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6x =36
x=36/6
x=6
(en cualquer ecuancion de las primeras se remplasa la x "yo escoji la primera")
6(6)+8y=20
36+8y=20
8y=20-36
y=-16/8
y=-2