It would cost about $4.86!
Answer:

Step-by-step explanation:
y = mx + b
m = slope
b = y-intercept
The slope can be found from two points.

The two points from the graph are (1, 9) and (2, 12).
Plugging in the values and evaluating.



The slope of the line is 3.
The y-intercept of the line is where the line cross the y-axis.
The line crosses the y-axis at (0, 6).

The slope-intercept form of the line is:

Step-by-step explanation:
4/7÷21/3
=4/7*3/21
=12/147
The value of x in the proportion is x = 39/8
<h3>How to solve the proportion?</h3>
The proportion is given as:
3/8 =x/13
Cross multiply
8 * x = 3 * 13
Evaluate
8x = 39
Divide by 8
x = 39/8
Hence, the value of x in the proportion is x = 39/8
Read more about proportions at:brainly.com/question/1781657
#SPJ1