Solve for x and
y from the following 2 equations in
2 unknowns:3x + -2y = 12
a11 = 3
a12 = -2
b1 = 12
6x + 4y = -3 a12 = 6
a22 = 4
b2 = -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 TI-83, 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 TI-83)
7) Scroll to MATH
8) Press [ALPHA] [B] [2nd] [MATRX] [1] [)] [ENTER]
(With the TI-83, 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
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