2+(-6y)+5y-8y and y equals -4 show work

Can someone explain the elimination method to me for this problem?

If the table of the function contains exactly two potential turning points, one with an input value of –1, which statement best describes all possible values of m? m ≥ –12 –12 < m < 4 m ≤ 4 m ≥ 4 or m ≤ –12

Fill in the table with whole numbers to make 430 in five different ways