IDNLearn.com is the perfect place to get detailed and accurate answers to your questions. Get accurate and detailed answers to your questions from our dedicated community members who are always ready to help.

Solve the following simultaneous equation:
[tex]$
\left\{\begin{array}{l}
x + y = 7 \\
2x + 3y = 4
\end{array}\right.
$[/tex]


Sagot :

Of course, let's solve the given system of simultaneous equations step-by-step:

Given the system of equations:
[tex]\[ \begin{cases} 1. & x + y = 7 \\ 2. & 2x + 3y = 4 \end{cases} \][/tex]

1. Solve the first equation for [tex]\( y \)[/tex]:
[tex]\[ x + y = 7 \implies y = 7 - x \][/tex]

2. Substitute [tex]\( y = 7 - x \)[/tex] into the second equation:
[tex]\[ 2x + 3(7 - x) = 4 \][/tex]

3. Expand and simplify the second equation:
[tex]\[ 2x + 21 - 3x = 4 \][/tex]
[tex]\[ 2x - 3x + 21 = 4 \][/tex]
[tex]\[ -x + 21 = 4 \][/tex]

4. Rearrange to solve for [tex]\( x \)[/tex]:
[tex]\[ -x + 21 = 4 \implies -x = 4 - 21 \implies -x = -17 \implies x = 17 \][/tex]

5. Substitute [tex]\( x = 17 \)[/tex] back into the equation [tex]\( y = 7 - x \)[/tex] to find [tex]\( y \)[/tex]:
[tex]\[ y = 7 - 17 \][/tex]
[tex]\[ y = -10 \][/tex]

Thus, the solution to the system of equations is:
[tex]\[ x = 17 \quad \text{and} \quad y = -10 \][/tex]

So, the values are [tex]\( x = 17 \)[/tex] and [tex]\( y = -10 \)[/tex].