# Thread: pre-calc numbers problem-urgent help!

1. ## pre-calc numbers problem-urgent help!

The sum of two numbers is twice their difference. The larger number is 7 more than twice the smaller. Find the numbers.

2. Originally Posted by tmac11522
The sum of two numbers is twice their difference. The larger number is 7 more than twice the smaller. Find the numbers.
Let the numbers be a and b

$\displaystyle a+b = 2(a-b)$ (eq1)

$\displaystyle b-2a = 7$ (eq2)

From this you can solve it simultaneously

3. Originally Posted by tmac11522
The sum of two numbers is twice their difference. The larger number is 7 more than twice the smaller. Find the numbers.
let x and y be two required numbers. Let x be the larger number in concern.

1) the sum of two numbers is twice their difference

$\displaystyle x+y = 2 (x-y)$

2) the larger number is 7 more than twice the smaller.

$\displaystyle x = 2y + 7$

you now have two equations and two unknown. Use substitution to solve.

P.S. this is wrong section. If this is a pre-calc problem you should have posted it in pre-calc section.