if the present age of son and father are expressed by x and y respectively after ten years father will be twice as old as his son.Write the relation between x and y

Present age of son = x years
and present age of father = y years
After 10 years, father's age = (y + 10) years and son's age = (x + 10) years
Now according to the question, after ten years father will be twice as old as his son. So we have;
y+10 = 2x+10y+10 = 2x+20y= 2x+20-10y = 2x+10y = 2x+5
Therefore the relationship between x and y is y = 2(x + 5)

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