Math 6A (Periods 2 & 4)

Solving Other Equations & Inequalities 2-5 cont'd
Parent: "What did you do today in Math?"
Student: "Today Mrs. Nelson taught us how to wrap and unwrap a present!!!"
Parent: "Huh..."
Student: "Well, it all has to do with PEMDAS... and undoing equations to solve them!!

Someone was paying attention today... :)


In order to solve two step or multi-step equations you must UNDO in the reverse order of PEMDAS...

UNDO by doing the reverse of PEMDAS

4x + 172 = 248

I will review the Formal Check on Monday but if you want to see-- read on...
CHECK:

Step 1: Rewrite the problem
Step 2: Substitute the solutions for the variable
Step 3: DO THE MATH

4x + 172 = 248
We found that x = 19 above-- > in the first problem
so for the check
4x + 172 = 248
4(19) + 172 ?=? 248
76 + 172 ?=? 248
248 = 248 CHECK!!!

For the above, you actually pace a “?” above the equal sign….rather than to each side…