This lesson is an introduction to equations containing two variables, such as y = 2x. In the first example, I make a table of x and y values based on the equation y = 2x, and then the plot the points from it, producing a graph of the equation.
Then we look at the same situation in reverse: a table of x and y values is given, and we need to write the equation and make a graph.
In the 2nd part of this lesson (below), we use two variables to describe some reallife situations. We look at two common reallife situations, and find two variables in each that change in relationship to one another. Then, we write an equation relating the two variables. Then we use a table to write down some values for the variables from the equation, and lastly plot those points to make a graph.
The first situation says that one light bulb costs $4. We consider the two variables: the number of light bulbs and the cost.
In the other situation, you bicycle at the speed of 15 km/h. In this case, the two variables are time and distance.
Write expressions from word phrases — video lesson
Math Mammoth Grade 6 curriculum
Math Mammoth TourConfused about the different options? Take a virtual email tour around Math Mammoth! You'll receive: An initial email to download your GIFT of over 400 free worksheets and sample pages from my books. Six other "TOURSTOP" emails that explain the important things and commonly asked questions concerning Math Mammoth curriculum. (Find out the differences between all these differentcolored series!)This way, you'll have time to digest the information over one or two weeks, plus an opportunity to ask me personally about the curriculum. A monthly collection of math teaching tips & Math Mammoth updates (unsubscribe any time) We respect your email privacy.
Note: You will FIRST get an email that asks you to confirm your email address. If you cannot find this confirmation email, please check your SPAM/JUNK folder. 
"Mini" Math Teaching CourseThis is a little "virtual" 2week course, where you will receive emails on important topics on teaching math, including:
 How to help a student who is behind You will also receive: A GIFT of over 400 free worksheets and sample pages from my books right in the very beginning. A monthly collection of math teaching tips & Math Mammoth updates (unsubscribe any time)We respect your email privacy.
Note: You will FIRST get an email that asks you to confirm your email address. If you cannot find this confirmation email, please check your SPAM/JUNK folder. 
Maria's Math TipsEnter your email to receive math teaching tips, resources, Math Mammoth news & sales, humor, and more! I tend to send out these tips about once monthly, near the beginning of the month, but occasionally you may hear from me twice per month (and sometimes less often). Peek at the previous tips here. You will also receive:
We respect your email privacy.
