What is the domain of the function shown in the mapping? i n c l u d e s picture {x | x = –5, –3, 1, 2, 6} {y | y = –9, –6, 0, 2, 4} {x | x = –9, –6, –5, –3, 0, 1, 2, 4, 6} {y | y = –9, –6, –5, –3, 0, 1, 2, 4, 6}

Choice A) 
{x | x = -5, -3, 1, 2, 6}



Explanation:

The domain is the set of allowed inputs of a relation or function. All you have to do is list the values in the "input" oval. Those values are -3, 2, -5, 1, 6 when we read from the top down. Sort them to get -5, -3, 1, 2, 6 which is what choice A says. 

Another way is to look at choices B through D. Notice they have -9 in them. The value -9 is not in the input oval (but in the output oval). So we can eliminate B through D. Leaving the only answer of choice A

Y= -2x-1 the negative in front of the 2 is because the slope is negative and the -1 is because it’s down 1 on the y axis.

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