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(a) write a matrix equation that is equivalent to the system of linear equations, and

(b) solve the system using the inverse matrix.
2x + 3y = 5
3x+5y=8

1 Answer

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Final answer:

The matrix equation equivalent to the given system is represented as AX=B, where A is the matrix of coefficients, X is the matrix of variables, and B is the matrix of constants. After calculating the inverse matrix of A, it's multiplied by B to solve for X. The solution to the system is x=1 and y=2.

Step-by-step explanation:

To write a matrix equation that is equivalent to the given system of equations:

2x + 3y = 5

3x + 5y = 8

We can express this system as AX=B, where A is the matrix of coefficients, X is the column matrix of variables, and B is the column matrix of constants:

A = \begin{bmatrix} 2 & 3 \\ 3 & 5 \end{bmatrix}

X = \begin{bmatrix} x \\ y \end{bmatrix}

B = \begin{bmatrix} 5 \\ 8 \end{bmatrix}

To find the solution using the inverse matrix, we need to calculate A-1 and then multiply it by B:

A-1B = X

Following the steps to find the inverse, we get:

A-1 = \begin{bmatrix} 5 & -3 \\ -3 & 2 \end{bmatrix}

Then, we calculate the product of A-1 and B:

X = A-1B = \begin{bmatrix} 5 & -3 \\ -3 & 2 \end{bmatrix} * \begin{bmatrix} 5 \\ 8 \end{bmatrix} = \begin{bmatrix} 1 \\ 2 \end{bmatrix}

Thus, the solution to the system is x = 1 and y = 2.

User Dan Gravell
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