Ariel B. answered 09/03/24
Honors MS in Theor. Physics, solid Math. background and 10+tutoring
Hi Oranuo,
When 2 matrices say, aik and bik are equal it means that a11=b11 , a12=b12 etc. In the given matrices only 2 elements contain x or y (and thus allow us to write an equations to determine x and y):
2=x+3. and 2=3y-4
from which one can find x and y
As to the other two of the 4 elements of the matrices, they present obvious statements: 1=1 and -3=-3
Hope this would help
Best,
Dr.Boroda

Oranuo W.
Thanks Dr. Boroda. This question was given in an assignment and was worth 5 marks, hence I wanted to see if there was a longer working out required to the obvious one, so I solved the left-hand determinant to be 7 and the right-hand determinant to be (x+3)(3y-4)-(-3) to get 4 = (x+3)(3y-4). Please correct me if I'm wrong here.09/03/24
Michael H.
09/03/24