An equation is formed of two equal expressions. The correct option is C.
<h3>What is an equation?</h3>An equation is formed when two equal expressions are equated together with the help of an equal sign '='.
The equation of the graph that Edwin graphs can be written as,
slope, m = (7-0)/(2-0) = 3.5
c = 0
The equation of the graph that Edwin graphs is p=3.5g.
The equation for the amount Sam spends on milk is given as p=3.4g.
Comparing the two equations the cost of milk per gallon for Edwin is $3.50, while the cost of milk per gallon for Sam is $3.40.
Hence, the correct option is C.
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