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x+y=10
10x+y=10y+x-36,,,,,,,10x-x+y-10y= -36.............9x-9y= -36 dividimos
todo entre 9
x-y= -4
hacemos reduccion:
x+y=10
x-y= -4
2x=6...............x=6/2...........x=3
si x=3
x+y=10
3+y=10
y=10-3
y=7
x=3 decenas y=7 unidades
el numero es el 37