Question

Two number's differs by 1. The Sum of the bigger number and twice the smaller number is 13. find the number​

Answer 1

the bigger number is 5 while the smaller number is 4

Explanation:

x-y=1 eqn 1

x+2y=13 eqn 2

from equation 1

x=1+y

substitute in eqn 2

1-y+2y=13

1+3y=13

y=4

x=1+y

x=1+4

x=5