The paint cost per gallon is $18.
What is a linear equation?
The linear equation is an equation where the highest degree of the variable used in the equation is 1.
For example 4x+5=29
Martin requires 3.25 gallons of red paint for the small barn.
Also, 1.25 gallons of paint is required for his shed.
Total number of gallons required for painting= number of gallons of red paint for the small barn+ number of gallons of paint for the shed
= 3.25 + 1.25
=4.5
The money that he wants to spend is $81.
Assume paint cost per gallon is x
the total number of gallons is 4.5 gallons.
The total amount of cost for painting will be = number of gallons * paint cost per gallon
⇒ 81= 4.5*x
⇒4.5x=81
⇒ x= 81/4.5
⇒ x= 18
Therefore the paint cost per gallon is $18.
Learn more about linear equation
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