matrices namingcalculatorapplication. making & naming a matrix matrix a
TRANSCRIPT
MatricesMatrices
NamingNaming
CalculatorCalculator
ApplicationApplication
Making & Naming a Making & Naming a MatrixMatrix
Matrix A
Matrix A is called a “Two by Three”“2 x 3”Rows first, Columns next
You have to Row your boat before you can
Come
The 2 x 3 is called DIMENSIONS
What are the dimensions of Matrix C?
3 x 2
3 Rows
2 Columns
ADDRESS: Row 3, Column 2
32C
Continuing in the CalcContinuing in the Calc
Multiplying MatricesMultiplying Matrices
Columns in A = 3Rows in B = 3 MULTIPLY!
Columns in C = 2Rows in D = 3 do NOT multiply!
Solving Systems Using Solving Systems Using MatricesMatrices
THE BASICS:THE BASICS:
If If 2x = 102x = 10
Then (1/2)2x = 10 Then (1/2)2x = 10 (1/2)(1/2)
x = 5x = 5
We took the We took the reciprocal or reciprocal or inverse of 2 to solve inverse of 2 to solve the equation.the equation.
Special button on calculator
Using the CalculatorUsing the Calculator
Matrix A is a 2 x 2 Matrix B is a 2 x 1
Solve for x by taking the inverse of A (use the special button!)
Putting it togetherPutting it together
x is -7 and y is 15
ExampleExample
CalculatorCalculator