Why are these triangles congruent?

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.

When only separate discreet points are graphed it is called?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?