color(blue)(1->)1→The general shape of the graph y=x^2 y=x2 is that of uu∪
color(blue)(2->)2→The -4 lowers the graph of y=x^2y=x2 by 4
color(blue)(3->)3→Putting a minus sign in front of the x^2x2 so that we have y=-x^2-4y=−x2−4 turns the whole thing upside. Now we have the general shape nn∩
color(blue)(4->)4→the 1/313 in y=-1/3x-4y=−13x−4 has the effect of widening the graph