IDNLearn.com: Where your questions meet expert answers and community support. Our community is here to provide detailed and trustworthy answers to any questions you may have.

Solve the following system of equations:

[tex]\[
\left\{
\begin{array}{lll}
2x & + y & = 8 \\
3x & - 2y & = 5
\end{array}
\right.
\][/tex]


Sagot :

Sure, let's solve this system of linear equations step-by-step:

We have the following system of equations:
[tex]\[ \begin{cases} 2x + y = 8 \quad \text{(1)} \\ 3x - 2y = 5 \quad \text{(2)} \end{cases} \][/tex]

Step 1: Solve one of the equations for one variable.

We can solve Equation (1) for [tex]\(y\)[/tex]:
[tex]\[ y = 8 - 2x \][/tex]

Step 2: Substitute this expression into the other equation.

Substitute [tex]\(y = 8 - 2x\)[/tex] into Equation (2):
[tex]\[ 3x - 2(8 - 2x) = 5 \][/tex]

Step 3: Simplify and solve for [tex]\(x\)[/tex].

Distribute the [tex]\(-2\)[/tex] and combine like terms:
[tex]\[ 3x - 16 + 4x = 5 \][/tex]
[tex]\[ 7x - 16 = 5 \][/tex]

Add 16 to both sides:
[tex]\[ 7x = 21 \][/tex]

Divide both sides by 7:
[tex]\[ x = 3 \][/tex]

Step 4: Substitute [tex]\(x\)[/tex] back into the expression for [tex]\(y\)[/tex].

Now we substitute [tex]\(x = 3\)[/tex] back into [tex]\(y = 8 - 2x\)[/tex] to find [tex]\(y\)[/tex]:
[tex]\[ y = 8 - 2(3) \][/tex]
[tex]\[ y = 8 - 6 \][/tex]
[tex]\[ y = 2 \][/tex]

Final Solution:

Putting it all together, the solution to the system of equations is:
[tex]\[ (x, y) = (3, 2) \][/tex]

So, the solution is:
[tex]\[ x = 3, \quad y = 2 \][/tex]