Question

Solve the system using matrices.
{x+2y=-1
{-x-3y=-2

Can someone please help? I don't get this at all.

Answer 1

http://youtu.be/YnjqgjefRyg?t=4m42s

Answer 2

Ax = B

A = [1 2]
[-1 -3]

x = B/A
x = 1/A *B
x = A^(-1)*B

Find the inverse of A then set
x = A^(-1)*[-1]
[-2]

Answer 3

@zozeebo, have you found the inverse of A yet?

Answer 4

I did, and I figured out the answer! Thank you!

Answer 5

Congrats