Factor (x^2+y^2-z^2)^2-4x^2y^2 as the product of four polynomials of degree 1, each of which has a positive coefficient of x.

Mr. jones determined that the equation y = 98 - 16/5 x could be used to predict his students' unit test scores, based on the number of days, x, a student was absent during the unit. what was the meaning of the y-intercept of the function? (by the way the 16/5 is a )