Answer:
$4.50
Explanation:
With the help of the graph we can guess two coordinates are
(2,9)
(2.5,12)
With the help of this we can find the equation of line and thus we can find the value of y for x=1.
we have two points and now we use the two point form to evaluate the relation among them
Two point form is given as
![(y-y_1)/(x-x_1)=](y_2-y_1)/(x_2-x_1)](https://img.qammunity.org/2020/formulas/mathematics/high-school/sgl929dccgmzmta8gih5bm0mb3pkqoxvsc.png)
(x_1, y_1)= (2,9.5)
(x_2, y_2)= (2.5,12)
Putting these values in formula
![(y-12)/(x-2.5)=(12-9.5)/(2.5-2)](https://img.qammunity.org/2020/formulas/mathematics/high-school/uoqcja177b58cickdbus4o7u77k5l435c6.png)
![(y-12)/(x-2.5)=(2.5)/(0.5)](https://img.qammunity.org/2020/formulas/mathematics/high-school/zv97mydmrqnutgiqn7jxvktgr8b6tp4rt3.png)
![(y-12)/(x-2.5)=5](https://img.qammunity.org/2020/formulas/mathematics/high-school/xegw4ddi252vmng2l9dsyspv5an1yf4tqv.png)
![(y-12)=5(x-2.5)](https://img.qammunity.org/2020/formulas/mathematics/high-school/lkjfftcdif663hs6hj6yfb5ukvgw3r566z.png)
![y=5x-12.5+12.00](https://img.qammunity.org/2020/formulas/mathematics/high-school/6v35eq8o07h85qyc81pug9x3yry05bykq0.png)
![y=5x-0.50](https://img.qammunity.org/2020/formulas/mathematics/high-school/262dg6yfrm8lc6absz8viclg9bb4vb8css.png)
Now we put x = 1 and then solve it for y
![y=5(1)-0.50](https://img.qammunity.org/2020/formulas/mathematics/high-school/7lzczi8w3z8bpmojidif77hprqkksaa6qp.png)
![y=4.50](https://img.qammunity.org/2020/formulas/mathematics/high-school/unut8wbqxq5y1fjdgye2et43n53jaik6mg.png)
Hence the amount earned in 1 hours of walk is $4.50