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

a=[acbd]
find the value of a-b+c+d
4x + 2y=7
5x-6y=9

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.

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.