Independent and Dependent Variables. Warm- Up 4 friends went to a restaurant and bought the same dinner that cost m amount of money. Since they had 4.

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Presentation transcript:

Independent and Dependent Variables

Warm- Up 4 friends went to a restaurant and bought the same dinner that cost m amount of money. Since they had 4 people, they got $10 off. Write an expression for this situation. Using your expression, if the friends spent a total of $150 how much money did each meal cost?

Worksheet Answers 1.m – 5 = 15 1.m = s = 24 1.s = 6 3.3c -20 = 55 1.c = h + 10 = 85 1.h = 3 5.3s + 8 = s = h + 6 = 10 1.h = 4 7.4d – 10 = d = 40

What are independent and dependent variables? Independent Variable: A variable that stands alone and isn't changed by the other variables you are trying to measure. For example, someone's age might be an independent variable. Dependent Variable: A variable that depends on other factors. For example, a test score could be a dependent variable because it could change depending on several factors such as how much you studied, how much sleep you got the night before you took the test, or even how hungry you were when you took it.

How does this relate to variables? The independent variable is represented by the x-value. Independent variables should be plotted on the x-axis. The dependent variable is represented by the y-value. Independent variables should be plotted on the y-axis.

How do you tell them apart? Ask yourself the question: Which one of these depends on the other? independent-and-dependent-variableshttp:// independent-and-dependent-variables

Warm-Up 1.Convert 2/9 to a decimal. (top dog goes in the house) 2.Convert.75 to a percent 3.Convert 68% to a decimal

BrainPop!!! inglinearequations/ inglinearequations/ In a linear equation, the graph of the coordinate pairs created from the table will make a straight line. We are going to create linear equations from tables and then graph!

Table Example! Carrot Cake Recipe Cups of Flour (x)23456 Number of Eggs (y) Look for a pattern that relates each pair of values in the table. 1.The first ratio is 2 cups of flour/4 eggs 2.Pattern: Multiply each x value by 2 2.Write a rule 1.The number of eggs (y) equals 2 times the number of cups of flour (x). 2.The rule is: y = 2  x or y = 2x

Now create a graph from the table! Remember: independent variable goes on the x axis and the dependent variable will go on the y-axis Label each axis, title the graph, and use a straight edge to connect your points!! Once you connect your points, they should make a straight/diagonal line.

Graph the Linear Equation y = 2x

More tables! Distance Ran Miles1234 Minutes What is the rule for the distance he ran? 2.If he ran for 26.2 miles, how many minutes would it take? y = 7x y = minutes (approx. 3 hours)

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How do independent and dependent variable work? hine.htmlhttp:// hine.html Sometimes the independent variable is called the “input” and the dependent variable is called the “output.”