Question

Given the system of equations, what is the value of the system determinant?

Answer 1

Answer: The answer is -3

Step-by-step explanation: I know because I just got it right.

Answer 2

2x + y = 8
x - y = 10
--------------add
3x = 18
x = 6

x - y = 10
6 - y = 10
-y = 10 - 6
-y = 4
y = -4

solution is : (6,-4)