The explicit equation for the number of guppies is: [tex]\mathbf{y = 10 \times 3^x}[/tex]
The table is an illustration of an exponential model.
An exponential model is represented as:
[tex]\mathbf{y = ab^x}[/tex]
Let x represents the number of weeks, and y represents the number of guppies.
When x = 0, y = 10
So, we have:
[tex]\mathbf{10 = ab^0}[/tex]
[tex]\mathbf{10 = a \times 1}[/tex]
[tex]\mathbf{10 = a}[/tex]
Rewrite as:
[tex]\mathbf{a = 10 }[/tex]
When x = 1, y =30
So, we have:
[tex]\mathbf{30 = ab^1}[/tex]
[tex]\mathbf{30 = ab}[/tex]
Substitute 10 for (a)
[tex]\mathbf{30 = 10b}[/tex]
Divide both sides by 10
[tex]\mathbf{3 = b}[/tex]
Rewrite as:
[tex]\mathbf{b = 3 }[/tex]
Substitute 3 for b and 10 for (a) in [tex]\mathbf{y = ab^x}[/tex]
Hence, the explicit equation is: [tex]\mathbf{y = 10 \times 3^x}[/tex]
Read more about explicit equations at:
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