ALGUÉM PODE VERIFICAR PRA MIM SE A RESOLUÇÃO ESTÁ CORRETA,OBRIGADA!! Calcule os valores de x e y,sabendo que x/2= y/5 e x + y =21

x/2=y/5
5x/10=2y/10 tirei o mmc de 2 e 10
5x=2y
x=2y/5

x + y= 21
2y/5 + y =21
2y + 5y/5 = 105/5
7y= 105
y= 105/7
y= 15

x= 2y/5
x= 2 . 15/5
x= 30/5
x= 6
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