Question

Is this a function?
{(8,-2),(4,-6),(6,-8),(7,5),(2,4)}
Then state the domain and range.

Answer 1

Here looking at x in (x,y) pairs

`\\ \sf\longmapsto 8\\eq4\\eq6\\eq 7\\eq 2`

• Every value has a unique image
• Hence its a function

`\\ \sf\longmapsto D_f=\{8,4,6,7,2\}`

`\\ \sf\longmapsto R_f=\{-2,-6,-8,5,4\}`