Write equivalent expression in different forms to show relationship

Which statement best describes the polynomial

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

A+b= 17, ab=70, find the value of |a-b|