Y=4 because y is 4 all the time
Their error is that they divided 12 by 30, instead of 30 by 12 in order to get the price per pair
the correct unit price is $2.50 per pair
2.5 * 12 = 30
The answers are A and F.
You can tell by looking at the slopes and seeing that they've been flipped and one is positive while the other is negative.
That rounded to the nearest thousand would be 1,317.000
The graph has a y-intercept of 2. Hope this helps :)