Question

One number is 7 more than another number. The sum of the numbers is 63. What are the numbers?

Answer 1

x = y + 7
x + y = 63

Can you solve from here?

Answer 2

See, Let the one number be y
and let the other number be : x
So
y = x + 7 ---------------1

x + y = 63

So, put the value of y in it:
x + x + 7 = 63

2x = 56

x = 28

So, the other number is: y = x + 7 = 28 + 7 = 35

So, the numbers are 28 and 35..