I hope this helps you
if 344 miles 11 hours
? miles per a hour
?.11=1.344
?=34
(x+1)+(3x-5)=180
4x-4=180
4x=184
x=46
3(46)-5
138-5
133
mZ133*
For a relation to be a function, each input must lead to a UNIQUE output. i.e. the same input must not lead to different outputs which is the case in TABLES A, B and D. Therefore, only table C represents a function.