finding midpoint of a line with given interval

my question is given the interval 2 is less than or equal to x which is less than or equal to 10; find the midpoint of a the line y = 4x+8

the midpoint x is given by
x=1/2 (2+10)=6

what is y when x=6?


How do you find the midpoint of 5 and 7

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