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Application Problems Involving Systems of Equations

Set up a linear system and solve for the following problem:

1. The sum of two integers is 41, and their difference is 5. Find the integers.


Sagot :

Let's set up and solve the system of equations step-by-step:

1. Identify the Variables:
- Let [tex]\( x \)[/tex] be the first integer.
- Let [tex]\( y \)[/tex] be the second integer.

2. Set up the Equations:
- According to the problem, the sum of the two integers is 41. This gives us the first equation:
[tex]\[ x + y = 41 \][/tex]

- The problem also states that the difference between the two integers is 5. This gives us the second equation:
[tex]\[ x - y = 5 \][/tex]

3. Write the System of Equations:
[tex]\[ \begin{cases} x + y = 41 \quad \ \ \ (1)\\ x - y = 5 \ \ \ \ \quad (2) \end{cases} \][/tex]

4. Solve the System of Equations:
- We will solve this system by adding and subtracting the equations to eliminate one of the variables.

- First, add the two equations (1) and (2):
[tex]\[ (x + y) + (x - y) = 41 + 5 \][/tex]
- Simplify this:
[tex]\[ x + y + x - y = 46 \][/tex]
[tex]\[ 2x = 46 \][/tex]
[tex]\[ x = \frac{46}{2} \][/tex]
[tex]\[ x = 23 \][/tex]

- Now, use the value of [tex]\( x \)[/tex] in either equation (1) or (2) to find [tex]\( y \)[/tex]. Let's use equation (1):
[tex]\[ x + y = 41 \][/tex]
[tex]\[ 23 + y = 41 \][/tex]
[tex]\[ y = 41 - 23 \][/tex]
[tex]\[ y = 18 \][/tex]

5. Conclusion:
- The solution to the system of equations is [tex]\((x, y) = (23, 18)\)[/tex].
- Therefore, the two integers are [tex]\( 23 \)[/tex] and [tex]\( 18 \)[/tex].
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