We are given the following matrix equation: $ \begin{bmatrix} 4 & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} \frac{1}{3} & -6 & -15 \\ \frac{1}{3} & -3 & q \end{bmatrix} = \begin{bmatrix} 14 & -3 \\ 13 & -20 \end{bmatrix} $ We are asked to find the values of $p$ and $q$. Note, the $p$ variable in the first matrix is mistakenly written as a column. It should be in the first row. I assume that the first matrix is a $2 \times 2$ matrix, and the second matrix is a $2 \times 3$ matrix. Therefore, the product will be a $2 \times 3$ matrix. This differs from the given $2 \times 2$ matrix on the right-hand side. There must be a typo somewhere. Let's assume the second matrix is a $2 \times 2$ matrix, thus: $ \begin{bmatrix} 4 & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} -6 & -15 \\ -3 & q \end{bmatrix} = \begin{bmatrix} 14 & -3 \\ 13 & -20 \end{bmatrix} $ This changes the question to finding the values of $q$. This is still wrong because multiplying a $2 \times 2$ matrix with another $2 \times 2$ matrix will give a $2 \times 2$ matrix. Therefore, the actual question may have been $ \begin{bmatrix} p & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} \frac{1}{3} & -6 \\ \frac{1}{3} & q \end{bmatrix} = \begin{bmatrix} 14 & -3 \\ 13 & -20 \end{bmatrix} $ This means the question is to find $p$ and $q$.

AlgebraMatricesMatrix MultiplicationLinear EquationsProblem Analysis
2025/5/9

1. Problem Description

We are given the following matrix equation:
[4236][13615133q]=[1431320] \begin{bmatrix} 4 & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} \frac{1}{3} & -6 & -15 \\ \frac{1}{3} & -3 & q \end{bmatrix} = \begin{bmatrix} 14 & -3 \\ 13 & -20 \end{bmatrix}
We are asked to find the values of pp and qq. Note, the pp variable in the first matrix is mistakenly written as a column. It should be in the first row. I assume that the first matrix is a 2×22 \times 2 matrix, and the second matrix is a 2×32 \times 3 matrix. Therefore, the product will be a 2×32 \times 3 matrix. This differs from the given 2×22 \times 2 matrix on the right-hand side. There must be a typo somewhere. Let's assume the second matrix is a 2×22 \times 2 matrix, thus:
[4236][6153q]=[1431320] \begin{bmatrix} 4 & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} -6 & -15 \\ -3 & q \end{bmatrix} = \begin{bmatrix} 14 & -3 \\ 13 & -20 \end{bmatrix}
This changes the question to finding the values of qq. This is still wrong because multiplying a 2×22 \times 2 matrix with another 2×22 \times 2 matrix will give a 2×22 \times 2 matrix.
Therefore, the actual question may have been
[p236][13613q]=[1431320] \begin{bmatrix} p & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} \frac{1}{3} & -6 \\ \frac{1}{3} & q \end{bmatrix} = \begin{bmatrix} 14 & -3 \\ 13 & -20 \end{bmatrix}
This means the question is to find pp and qq.

2. Solution Steps

Let the given matrix equation be:
[p236][13613q]=[143120] \begin{bmatrix} p & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} \frac{1}{3} & -6 \\ \frac{1}{3} & q \end{bmatrix} = \begin{bmatrix} 14 & -3 \\ 1 & -20 \end{bmatrix}
The entry in the first row and first column of the product is p(13)+(2)(13)=p323=p23p(\frac{1}{3}) + (-2)(\frac{1}{3}) = \frac{p}{3} - \frac{2}{3} = \frac{p-2}{3}. This must equal
1

4. $ \frac{p-2}{3} = 14 $

p2=42 p - 2 = 42
p=44 p = 44
The entry in the first row and second column of the product is p(6)+(2)(q)=6p2qp(-6) + (-2)(q) = -6p - 2q. This must equal -

3. $ -6p - 2q = -3 $

Substituting p=44p = 44, we get:
6(44)2q=3 -6(44) - 2q = -3
2642q=3 -264 - 2q = -3
2q=261 -2q = 261
q=130.5 q = -130.5
We can confirm using the second row:
Entry (2,1) is 3(13)+(6)(13)=12=13(\frac{1}{3}) + (-6)(\frac{1}{3}) = 1 - 2 = -1. Given is 13, so there is a typo in the matrix entry.
Entry (2,2) is 3(6)+(6)(q)=186q3(-6) + (-6)(q) = -18 - 6q. This must equal -
2

0. $ -18 - 6q = -20 $

6q=2 -6q = -2
q=13 q = \frac{1}{3}
Assuming entry (2,1) is 13 is a typo: entry (2,1) is equal to
1.

3. Final Answer

Given the assumption that the entry (2,1) is incorrect in the final matrix, and instead equals -1:
p=44p = 44
q=130.5q = -130.5
If we assume the given matrix is correct as is and entry (2,1) is actually 13:
Given the assumption that the entry (1,1) is incorrect in the final matrix, and instead equals 14/314/3:
p=44p = 44
q=13q = \frac{1}{3}
There seems to be a typo in the original question. There seems to be multiple versions to the correct answer given multiple typo assumptions.
Let us assume:
[4236][13613q]=[14/33120]\begin{bmatrix} 4 & -2 \\ 3 & -6 \end{bmatrix} \begin{bmatrix} \frac{1}{3} & -6 \\ \frac{1}{3} & q \end{bmatrix} = \begin{bmatrix} 14/3 & -3 \\ 1 & -20 \end{bmatrix}
[4/32/3242q12186q]=[14/33120] \begin{bmatrix} 4/3 - 2/3 & -24 - 2q \\ 1-2 & -18-6q\end{bmatrix} = \begin{bmatrix} 14/3 & -3 \\ 1 & -20 \end{bmatrix}
2/3=14/3 2/3 = 14/3 which is not correct
1=1 -1 = 1 which is not correct
There must be a typo.
Final Answer: There are typos. We cannot find unique solutions for pp and qq.
Final Answer: The given problem has inconsistencies and typos, preventing a unique solution for pp and qq.
FINAL ANSWER: There are typos, and cannot solve with a unique answer.

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