Let D = the sales of DVDs in billions of dollars, S = the total sales of streamed videos in billions of dollars, and t = the number of years after 2009. D=−0.9⋅t+8.77D=-0.9⋅t+8.77 S=2.5+0.78⋅tS=2.5+0.78⋅t In what year should the DVD sales drop below 1.2 billion?Answer this question using algebra. Show all work with correct notation on paper
Equations and Inequations
Equations and inequalities describe the relationship between two mathematical expressions.
Linear Functions
A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.
We previously looked at DVD sales vs. video streaming. As before, numbers below are close to the correct values, but vary to allow more practice with this idea.
Use these equations for this question.
Let D = the sales of DVDs in billions of dollars, S = the total sales of streamed videos in billions of dollars, and t = the number of years after 2009.
D=−0.9⋅t+8.77D=-0.9⋅t+8.77
S=2.5+0.78⋅tS=2.5+0.78⋅t
In what year should the DVD sales drop below 1.2 billion?Answer this question using algebra. Show all work with correct notation on paper
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