Question

There are two numbers and the first is larger than the second. Three times

the larger number plus the smaller number is forty. Twice the smaller number
plus one is equal to the larger number. Find both numbers

Answer 1

3y+x=40

x=40-3y..........1

2x+1=y........2

subst. 2into1:

x=40-3(2x+1)

x=40-6x-3

7x=37

x=37/7

subst.x into2:

2(37/7)+1=y

y=81/7