Question

Give the linear system: 3x + 7y = 20 x ? 4y = 9 Identify the values for the elements in the coefficient matrix: A = a11 a12 a21 a22 a11 = a12 = a21 = a22 =

Answer 1

Answer: a11 = 3, a12 = 7, a21 = 1, a22 = -4

Explanation:

3x + 7y = 20

x  -  4y = 9

A = $\left[\begin{array}{ccc}3&7&20\\1&-4&9\end{array}\right]$

          column 1         column 2

row 1:    (a11) 3               (a12)   7

row 2:   (a21) 1               (a22) -4

Answer 2

Answer:

Step-by-step explanation:

Given is a linear system of equations in two variables x and y.

$3x+7y =20\\x-4y =9$

This can be represented in matrix form as

Ax = B where A is the matrix formed by coefficients of x and y

Hence A =

$\left[\begin{array}{ccc}3&7\\1&-4\end{array}\right]$

$a11 = 3\\a12 =7\\ a21 = 1\\a22 =-4$