Which one is the function and which one isn’t please help im failing rn .

Yes

Step-by-step explanation:

This relation is a function. Functions must have unique x-values for every y-value, this relation meets those requirements. Also, since this is a graph you can use the vertical line test. To pass the vertical line test you must be able to draw a vertical line on the graph and have it intersect with the function in no more than one place.

45 degres

step-by-step explanation:

sorey if i hav bad engelish im bad engelish

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.