1. Warm - Up Are you smarter than a 4 th grader???: There are three times as many dogs as birds There are 5 more cats than birds There are 24 cats How many dogs are there?

2. Alg2 Lesson 3-6 Systems with 3 variables Objectives: 1.Solve a system with 3 variables using elimination or substitution.

3. Graphs of Systems with 3 variables

4. Steps for Solving Systems of 3 Variables Use the first two equations and solve for one of the variables ( call new equation #4) Use the last two equations and solve for the same variable (call new equation #5) Use the two new equations (#4 and #5) and solve for one variable Substitute your known variable into equation #4 or #5 to solve for a second variable Substitute both known variables into one of the original equations to find final unknown variable

5. Simple example:

10. Pg 159 1 – 9 odd