Question

What is |Ax| in the system below?

4x-y=-3
-2x+y = 5

(the bottom is cut off, last 2 numbers are -2 and 1)​

Answer 1

The answer is C!

Explanation:

Edge 2021 :)

Answer 2

`c) \left|\begin{array}{ccc}-3&-1\\5&1\\\end{array}\right|`

Explanation:

Given system of equations are

4 x - y = -3

-2 x +y = 5

Now the Matrix form AX = B

`\left[\begin{array}{ccc}4&-1\\-2&1\\\end{array}\right]`
`\left[\begin{array}{ccc}x\\y\\\end{array}\right] = \left[\begin{array}{ccc}-3\\5\\\end{array}\right]`

Now replacing first column with 'B' matrix

`|A_(x) | = \left[\begin{array}{ccc}-3&-1\\5&1\\\end{array}\right]`

Now replacing second column with 'B' matrix

`|A_(y) | = \left[\begin{array}{ccc}4&-3\\-2&5\\\end{array}\right]`