Solve for x and
y from the following 2 equations in
2 unknowns:3x + 2y = 12
a_{11} = 3
a_{12} = 2
b_{1} = 12
6x + 4y = 3 a_{21} = 6
a_{22} = 4
b_{2} = 3
The A matrix is
3 2
6 4
The B matrix is
12
3
Note: When the B
matrix is placed after the A matrix,
a 2x3 matrix is
formed : 3 2
12
6 4
3
The 4th line of the
instructions below asks you to
" Input dimensions [2] [ENTER]
[3] [ENTER] ." It means 2 rows and 3
columns.
For solving 3 equations in 3
unknowns, you would need dimensions
of [3] by [4],
For solving 4 equations in 4
unknowns, you would need dimensions
of [4] by [5],
For solving 5 equations in 5
unknowns, you would need dimensions
of [5] by [6], and so on.....
To input and solve the matrix,
1) Press [2nd] [MATRX] (Note: On the TI83, press [MATRX])
2) Scroll to Edit
3) Press [1] to access matrix A
4) Input the dimensions [2] [ENTER] [3] [ENTER]
5) Input the matrix entries, pressing enter after each value.
6) Press [2nd] [QUIT] [2nd] [MATRX] (Press [2nd] [QUIT] [MATRX] on the TI83)
7) Scroll to MATH
8) Press [ALPHA] [B] [2nd] [MATRX] [1] [)] [ENTER]
(With the TI83, press [ALPHA] [B] [MATRX] [1] [)] [ENTER])
The solution to the above system of 2 equations in 2 unknown should appear as
x = 1.75 and y = 3.375




