Use Cramer's rule to solve the following system of equations. If D=0, use another method to solve the system.

Question

x+y=11
x-y=5

Answer 1

x =
|11 1|
|5 -1|
------
|1 1|
|1 -1|
= -16/-2 = 8
y = 11-x = 3

The | | /| | symbols represent the ratios of two 2x2 determinants