SOLUTION: 1. Three times the larger of two numbers is equal to four times the smaller. THe sum of the numbers is 21. Find the numbers. 2. The larger of two numbers is 1 more than twice th

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: 1. Three times the larger of two numbers is equal to four times the smaller. THe sum of the numbers is 21. Find the numbers. 2. The larger of two numbers is 1 more than twice th      Log On


   



Question 107505: 1. Three times the larger of two numbers is equal to four times the smaller. THe sum of the numbers is 21. Find the numbers.
2. The larger of two numbers is 1 more than twice the smaller. The sum of the numbers is 20 less than three times the larger. Find the numbers.

Answer by solver91311(24713) About Me  (Show Source):
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We are asked to find two numbers, so we will need two variables. Fortunately, there is enough information to establish two equation relationships between these numbers.

Let's call the larger number y and the smaller number x. The first fact we are given is that:

Eq 1) 3y=4x

And the second thing we know is that:

Eq 2) y%2Bx=21

Let's begin by dividing both sides of Eq 1) by 3 resulting in:


y=4x%2F3

Giving us an expression for y that we can substitute into Eq 2), thus:

4x%2F3%2Bx=21, which can then be solved for x

7x%2F3=21
x%2F3=3
x=9

Therefore:

y=21-9=12

To check the answer, put the values into the first relationship,

Eq 1) 3y=4x
3%2A12=4%2A9?
36=36Yes!