Question

Solve the system by using a matrix equation.

2x - 3y = 3
5x - 7y = 9

Answer 1

can you set up the matrix ?

Answer 2

it would be 2 x 2 matrix

Answer 3

-5 (2x-3y=3)
2 (5x-7y=9)
-10x+15y=-15
10x-14y=18

Answer 4

Now we have :
y=3

Answer 5

once you set up the matrix, call it A you have the problem

A v = b
where v is the vector [ x y] and b= [3 9] transposed (vertical)

use
http://www.mathsisfun.com/algebra/matrix-inverse.html
and scroll down to 2 x 2 matrix to find how to invert A

A_inv * A v = A_inv b
v = A_inv b

Answer 6

x = 3
Understand ?!
:D

Answer 7

E.ali, the question is asking to use a matrix approach, presumably to learn how to use matrices

Answer 8

I'm not sure how I would set up the matrix from the equations