Are there any two ordered pairs whose abscissas are equal? if yes, which ones? which rule does this set of ordered pairs belong?

•The first set of ordered pairs is said to be a function if no two ordered pairs have the same first coordinates with different second coordinates for example ( -1, 2), ( 1, 0), (2, 1) . The second example is not a function, because it contains the ordered pairs (1,2) and (1,4(-1, 4)). the first set is repeated . These have the same first coordinate and different second coordinates. Read the details about the set of ordered pairs in

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A relation is a rule that relates values from a set of values (called the domain) to a second set of values (called the range).

A relation is a set of ordered pairs (x,y).

Read the details about how functions related to relation in

Read the details about a relation is function in

answer:

38

step-by-step explanation

20-15+18+15 =‬38