Welcome to Westonci.ca, the ultimate question and answer platform. Get expert answers to your questions quickly and accurately. Experience the convenience of finding accurate answers to your questions from knowledgeable professionals on our platform. Our platform provides a seamless experience for finding reliable answers from a network of experienced professionals.

Solve the following system of equations:

[tex]\[
\begin{cases}
\frac{1}{3} x - \frac{1}{2} y = 4 \\
5x - y = -5
\end{cases}
\][/tex]


Sagot :

To solve the given system of linear equations, we need to find the values of [tex]\(x\)[/tex] and [tex]\(y\)[/tex] that satisfy both equations simultaneously. Let's start by writing the system of equations clearly:

1. [tex]\[\frac{1}{3} x - \frac{1}{2} y = 4\][/tex]
2. [tex]\[5x - y = -5\][/tex]

### Step-by-Step Solution

Step 1: Eliminate fractions in Equation 1

Multiply both sides of Equation 1 by 6 to eliminate the fractions:

[tex]\[6 \left(\frac{1}{3} x - \frac{1}{2} y \right) = 6 \cdot 4\][/tex]

This simplifies to:

[tex]\[ 2x - 3y = 24 \][/tex]

So, the system of equations becomes:

1. [tex]\( 2x - 3y = 24 \)[/tex]
2. [tex]\( 5x - y = -5 \)[/tex]

Step 2: Solve for one variable

Let's solve for [tex]\(y\)[/tex] in terms of [tex]\(x\)[/tex] using Equation 2:

[tex]\[ 5x - y = -5 \][/tex]

Rearrange to solve for [tex]\(y\)[/tex]:

[tex]\[ y = 5x + 5 \][/tex]

Step 3: Substitute y into Equation 1

Now substitute [tex]\( y = 5x + 5 \)[/tex] into Equation 1:

[tex]\[ 2x - 3(5x + 5) = 24 \][/tex]

Expand and simplify:

[tex]\[ 2x - 15x - 15 = 24 \][/tex]

[tex]\[ -13x - 15 = 24 \][/tex]

Add 15 to both sides:

[tex]\[ -13x = 39 \][/tex]

Divide by -13:

[tex]\[ x = -3 \][/tex]

Step 4: Solve for y using the value of x

Now that we have [tex]\( x = -3 \)[/tex], substitute this into [tex]\( y = 5x + 5 \)[/tex]:

[tex]\[ y = 5(-3) + 5 \][/tex]

[tex]\[ y = -15 + 5 \][/tex]

[tex]\[ y = -10 \][/tex]

Step 5: Write the solution

The solution to the system of equations is:

[tex]\[ x = -3 \][/tex]
[tex]\[ y = -10 \][/tex]

Therefore, the values of [tex]\(x\)[/tex] and [tex]\(y\)[/tex] that satisfy both equations are [tex]\( \mathbf{x = -3} \)[/tex] and [tex]\( \mathbf{y = -10} \)[/tex].