3.2 Solving Systems Algebraically
(Substitution)
**Not every system can be solved easily by graphing...think of answers that give you decimals or fractions or even graphs that have solutions so big, they would run off the paper...
ANY system can be solved algebraically . Title: Oct 7­2:28 PM (1 of 5)
One way to solve a system algebraically is by using substitution.
**What does the word substitution mean?
**What three things could happen when you graphed a system to find it's solution?
**Those same three things can still happen when you solve a system algebraically.
Title: Oct 7­2:32 PM (2 of 5)
Substitution:
The first step is to solve one equation for either x or y.
Make life easy!!!!!
Title: Oct 7­2:34 PM (3 of 5)
Solve using substitution:
Title: Oct 7­2:36 PM (4 of 5)
Homework:
Page 128
#'s 1 ­ 12
Title: Oct 7­2:44 PM (5 of 5)