What is the determinant of the coefficient matrix of the system –11 –2 0 55

The first two rows of coefficients are identical, so by inspection, the determinant is 0.

The determinant of  coefficient  matrix of the given system is 0.

Step-by-step explanation:

Given system of equation

The coefficient matrix of the system

Let A=

X=

B=

Therefore , we can AX=B

=

The determinant of  coefficient matrix of the given system is given by

By using determinant property : when two rowsor two columns are identical then the value of determinant is equal to zero .

m∠5 + m∠3 = m∠1   is true.

m∠5 + m∠6 = 180 is true

m∠2 +m∠3 = m∠6   is true

m∠2 +m∠3 +m∠5 = 180   is true