Answer :
The proportional equation for the the number of gallons of yellow paint, y needed for any amount of blue paint, b is:
- [tex]y(b) = \frac{8}{5}b[/tex]
Proportional equation:
- A proportional equation is modeled by:
[tex]y(b) = ab[/tex]
- In which a is the constant of proportionality.
In this problem, the parameters are:
- [tex]\frac{1}{2}[/tex] of a gallon of blue paint, hence [tex]b = \frac{1}{2}[/tex]
- [tex]\frac{4}{5}[/tex] of a gallon of yellow paint, hence [tex]y = \frac{4}{5}[/tex].
Then, to find the constant of proportionality:
[tex]y(b) = ab[/tex]
[tex]\frac{4}{5} = \frac{1}{2}a[/tex]
[tex]a = \frac{8}{5}[/tex]
Hence, the equation is:
[tex]y(b) = \frac{8}{5}b[/tex]
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