Answer:
Step-by-step explanation:
Given
The given equation is 
There are two functions i.e. 
Their intersection gives the solution of the above function
From the graph, we can see that both the graph intersects at two different points i.e. at

57 at 7.oo dollars is 399 so he bought 1 more at 1 dollar
Answer:
y = -1/2x
Step-by-step explanation:
The y - intercept is 0, because the point where the line touches the y - axis is y - value of 0
The slope is -1/2 because as it rises by -10, it runs by 20
Slope is rise/run which is -10/20 which simplifies to -1/2
y = mx + b
b = y - intercept
m = slope
y = -1/2x + 0 or y = -1/2x
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-Chetan K