Question

adriana used a system of equations in matrix form to identify her age (a) and the age of her sister (s).

a (1 -2)= (-13)
s (-3 4)= (15)

How old is Adriana?

Answer 1

okay, so the best way to do this is to reduce the matrix to echelon form.
have you learnt that? if you haven't then there is another way as well. it depends on what you know.

Answer 2

i don't understand the matrix to echelon form. I need to know how to do it. Will you be able to assist me with it?

Answer 3

Are you still there?

Answer 4

yeah.
okay so what you have is basically a form: AX = B
where A = the 2x2 matrix and X is the unknown. B is the (-13 15) matrix.

Answer 5

you have to make this into one matrix. so take out the X matrix, and combine the 2.