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a) Solve the system of equations:

[tex]\[
\left\{
\begin{array}{c}
2x + y = 11 \\
y = x + 2
\end{array}
\right.
\][/tex]


Sagot :

Sure! Let's solve the system of equations step-by-step:

[tex]\[ \left\{\begin{array}{c} 2x + y = 11 \\ y = x + 2 \\ \end{array}\right. \][/tex]

1. Substitute [tex]\( y \)[/tex] from the second equation into the first equation:

The second equation gives us:
[tex]\[ y = x + 2 \][/tex]

Substituting this expression for [tex]\( y \)[/tex] into the first equation:
[tex]\[ 2x + (x + 2) = 11 \][/tex]

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

Combine like terms:
[tex]\[ 2x + x + 2 = 11 \][/tex]

Simplify:
[tex]\[ 3x + 2 = 11 \][/tex]

Subtract 2 from both sides:
[tex]\[ 3x = 9 \][/tex]

Divide by 3:
[tex]\[ x = 3 \][/tex]

3. Substitute [tex]\( x = 3 \)[/tex] back into the second equation to find [tex]\( y \)[/tex]:

Using the second equation [tex]\( y = x + 2 \)[/tex]:
[tex]\[ y = 3 + 2 \][/tex]

Simplify:
[tex]\[ y = 5 \][/tex]

So, the solution to the system of equations is:

[tex]\[ x = 3, \quad y = 5 \][/tex]

Therefore, the solution to the given system of equations is [tex]\((x, y) = (3, 5)\)[/tex].