Math
posted by Jane .
twice a number minus a second number is 1. twice the second number added to three times the first number is 9. find the two numbers.

first number  x
2nd number  y
2x  y = 1
or
y = 2x+1
2y + 3x = 9
2(2x+1) + 3x = 9
4x + 2 + 3x = 9
7x = 7
x = 1
then y = 3
The first number is 1, and the second number is 3
check:
twice the first  second
= 2  3 = 1 , check!
twice the second added to three times the first
2(3) + 3(1)
= 9 , check! 
qed