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Direct Variations
Indirect Variations
Direct, Inverse, or None
True or False
Functions
100
y=kx
What is the equation form?
100
A relationship between two variables in which the product is a constant.
What is Indirect Variation?
100
y=36/x Direct, Inverse, or Neither?
What is Inverse?
100
xy= -18. This is Inverse. True or False?
Inverse
100
{(-6,8), (-4, 12), (-3,16), (-2,24)} This is an inverse variation. Why? *HINT: multiply each ordered pair together*
Each ordered pair when multiplied together, equals -48.
200
How do you test for Direct Variation?
divide y/x = same #
200
y= k/x : k= X x Y
What is equation form?
200
4y=x Direct, Inverse, or Neither?
What is Direct?
200
y = -2/5x + 1. This is neither inverse or direct. T or F?
True
200
{(3,2), (6,4), (12,8), (18,12)} Why isn't this a inverse variation?
Because when the origins are multiplied, they don't equal the same number.
300
What does "y varies directly as x" mean?
If x increases, y increases by the same factor.
300
When one variable increases the other decreases in proportion so that the product is unchanged. Is this true?
Yes it is true.
300
x + y = 0 Direct, Inverse, or Neither?
Neither
300
{(4,16), (5,12.8), (1.6,40), (20,3.2)} Is this an inverse variation. T or F?
True
300
{(0.5,6), (1,3), (3,1), (6,0.5)} Is this inverse variation a function?
Yes