Which of the following choices below represents a function? 1. y^2 = 8x - 7
2. y = x/6 + 13
3. y = x^2 - 5

Please help!
(^2 means squared btw)

With finding limits of multi variable !

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

Which equation is equivalent to the given expression? -(1/2y+1/4) a. -1/4(1+2y) b. 1/4(2y-1) c. -2(1/4y-1/8) d. 2(1/8-1/4y)