Multiply the Y matrix by 0.5, then add to the X matrix OR use the TI-84 matrix menu to do the calculations.
Answer
Example 2
Find Y-1.
Hint
Since this is a 3 × 3 matrix, use a calculator matrix menu to find the inverse of this. Check back to our Technology Alert in this section for detailed directions.
Answer
Example 3
Write
30x + 40y = 65 -25x – y = 3
in matrix form.
Hint
Use the coefficients in front of the x and y as entries in the matrix.
Answer
Example 4
Find XTY
Hint
Use a calculator! Find the transpose of X then perform matrix multiplication on the transpose and Y.
