The answer is 9.
We have been given that dimensions of original photo are 4 inches by 6 inches. We want the photo on the poster to be of dimensions 3 feet by 4 1/2 feet.
First of all we will convert dimensions of poster from feet to inches.
Now, let us compare sides of our original photo with corresponding sides of poster.
Now, let us compare the second pair of corresponding sides.
We have seen that sides of poster are 9 times the sides of our original photo, therefore, the scale factor of this dilation is 9.
You are looking for a line of the form
![y=a+Bx](https://tex.z-dn.net/?f=y%3Da%2BBx)
such that a,B minimize the distance between the given points and the line.
For that
![B=\frac{\sum ^n_{k=1}(x_ky_k-\bar{y}x_k)}{\sum ^n_{k=1}(x^2_{^{}k}-\bar{x}x_k)}](https://tex.z-dn.net/?f=B%3D%5Cfrac%7B%5Csum%20%5En_%7Bk%3D1%7D%28x_ky_k-%5Cbar%7By%7Dx_k%29%7D%7B%5Csum%20%5En_%7Bk%3D1%7D%28x%5E2_%7B%5E%7B%7Dk%7D-%5Cbar%7Bx%7Dx_k%29%7D)
and
![a=\bar{y}-\bar{Bx}](https://tex.z-dn.net/?f=a%3D%5Cbar%7By%7D-%5Cbar%7BBx%7D)
Now we just have to apply the formula
after we apply it we get that
ŷ = 1.50473 x + 12.90922
2x + 8 - 8 = 26
2x = 26
x = 13
Distance = 3 units .....................
Y=1/2x+1/2
the y intercept is 1/2 and the slope is 1/2