C & D Step-by-step explanation: One evident common factor between 60, 90, & 20 is 10 because all these numbers end in a 0; Therefore one way to factor the equation 60y - 90 - 20x is; 10 (6y – 9 – 2x) 5 is also a common factor between the numbers 60, 90, & 20 60/5 = 12; 90/5 = 18; 20/5 = 4 Therefore 60y - 90 - 20x is also equal to; 5 (12y – 18 – 4x)
