Y=8x^2 linear or non linear

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

Write the equation in general quadratic form: plz !