Monday, January 26, 2015

7.2 Solving Linear Equations Word Problems through Substitution

Hope you all had a good weekend.  Your homework was to watch the video in the last post.  I know we're not supposed to give homework on weekends but this seemed pretty important;)

Anyway, I'm hoping you are feeling confident with solving linear equations by graphing.  It's a lot of work but the goal was to see how all the tools: grids, equations, tables & graphs interrelate.  

As we've begun work on solving systems of linear equations I've gotten a resounding, "Wow, this is so much quicker!"  True, but we still want to maintain a conceptual understanding of the conceptual process of finding a shared solution point.

Accordingly, your homework will include translation tasks (words to algebra) and two word problems.

Please watch this video of me solving #16 on your homework and then complete the following:

HW: pg 386 #s 8, 14, 15, 16

Then answer:

HW: pg 387 #s 25 & 26 (pay close attention to "The value of x is 4 times the value of y"
                                     as you might write this as 4x = y which is incorrect.)

Watch the second video of me solving #29 starting with a grid and then using substitution (instead of tables & graphs) once I have the equations set up.  Write down the notes from my work on # 29 and then solve your own word problem #30 using a grid to make your equations and then substitution.

HW: pg 387 #s 29 & 30

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