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be the variable representing the cost of the ingredients. Let 
be a function of the cost of ingredients giving the price of the dish. Then, we can turn
and replace "cost of ingredients" with the variable 
.
and 
) to obtain:
.
.
and 
are both 1, so this is a linear equation of order 1. Therefore, the graph must be a straight line. We can eliminate A and E, since neither are straight lines. 
, where 
stands for the slope of the line and 
stands for the line's y-intercept. Since 
, the coefficient of x, is positive here, we are looking for a line that goes upwards. We can eliminate D since it goes downwards, and therefore has a negative slope.
, which represents the y-intercept, is also positive. Therefore, the line we are looking for also must intersect the y-axis at a positive value. The graph C appears to intersect the y-axis at a negative value, whereas the graph B appears to intersect the y-axis at a positive value. Therefore, B is the corresponding graph.
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