I am needing assistance, I need HELP!:

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

Y=4x^2+x-1 solve using quadratic formula

An equation representing lyle’s hedge-trimming business is a = 12n - 300 where a is the amount of profit or loss in dollars and n is the number of hedges trimmed. how would the graph of lyle’s business change if the equation a = 10n - 300 represented his business? the graph would be flatter. the graph would be steeper. the graph would start closer to the origin. the graph would start lower on the y-axis.