+28 Juan solves the system of equations by forming a matrix equation.
−4x+y=9
3x+2y=7
He multiplies the left side of the coefficient matrix by the inverse matrix.
How does he proceed to the solution?
+128462 [ 9 This goes in the first box
7 ]
The inverse is
1 [ 2 - 1 = 1 [ 2 - 1 This goes in the second box
___________ -3 - 4 ] - ______ -3 -4]
(2)(-4) - (1)(3) 11
-1 [ 2 - 1 [ 9 = -1 [ 11
__ -3 -4 ] 7 ] _______ -55] This goes in the third box
11 11
[ -1
5 ] This goes in the last box
