Math 11 class notes Tuesday September 13

In class we worked through the first part of a system of 3 equations in 3 variables. We used substitution, and we could have used elimination, to make one variable "x" temporarily go away.  We got to 2 equations in two variables, y and z. 

From this point we can again use substitution or elmination to make another variable go away so we can get one equation in one variable to solve..  In real-world problems, systems larger than 3 equations in 3 variables use computers because of the number of calculations involved.  When you learn about matrices, you will be able to use a graphing calculator to more quickly solve such systems.

Homework for Wednesday 9-14, page 21, items 1, 2, 3, 4, 5.  Assign two variables, and write constraints as inequalities.  This assignment is like the one with Roy buying tickets and meals.

From previous classes: