## anonymous 3 years ago Given the system of equations, what is the value of the system determinant? x + y = 8 x - y = 10

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1. anonymous

To find the determinant of a 2x2 matrix: $A = \left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\\ |A|=det(A)=ad-cb$

2. anonymous

I'd actually forgotten how to do this since it's been so long, and it literally took a 2 second Google search ;)

3. anonymous

a and c is the value of x and b and d is the value of y

4. anonymous

|dw:1361514044728:dw|

5. anonymous

then find the determinant according to the formula given by @fewscrewsmissing