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x+y=6
x+10y=6x
despejamos x en la primera ecuacion:
x+y=6
x=6-y
sustituimos en la segunda ecuacion x=6-y
x+10y=6x
6-y+10y=6(6-y)
6+9y=36-6y
9y+6y=36-6
15y=30
y=30/15
y=2
si y=2
x+y=6
x+2=6
x=6-2
x=4
decenas=4 unidades=2
el numero es el 42