The equation to find Shanti's age is y = x - 3 where y is Shanti's age.
Given,
Shanti's sister Uri is Shanti's age plus 3 years.
Uri is 7 years old.
We need to write an equation to find Shanti's age.
We have,
Uri age = Shanti age + 3______(1)
Uri = 7 years old
Putting in (1)
We get,
Uri age = Shanti age + 3
7 = Shanti age + 3
Subtracting 3 on both sides.
7 - 3 = Shanti age + 3 - 3
4 = Shanti age
We see that Shanti's age is 4 years old.
If we have to write an equation then,
Consider Uri's age to be x and Shanti's age to be y.
Now,
Uri age = Shanti age + 3
x = y + 3
Subtracting 3 on both sides
x -3 = y
y = x - 3 is our equation.
Thus the equation to find Shanti's age is y = x - 3.
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