Question

If the following system of equations was written as a matrix equation in the form AX=C , and matrix A was expressed in the form

Answer 1

Its -5

because a=4, b=5, c=2, d=-6

Answer 2

The given system of equations are :

4x + 2y=7

5x-6y=9

a   c       we have   4     2

b     d                       5      -6.

Comparing the two matrix we have a=4,b=5,c=2,d=-6

The question is asking us to find the value of a-b+c+d

Substituting the values of a,b,c,d we have:

a-b+c+d=4+(-5)+2+(--6)

=4-5+2-6=-11.