And explain how to solve these problems plz 10 points

it is given that y varies directly as x. if y = 5 when x = 4 determine the constant of variation.
a.-4/5\
b.4
c.5
b.5/4

it is given that y varies directly as x. if y = 10 when x = 3 determine the constant of variation.
a.-3/10
b.10
c.3
d.10/3

which of these is true?

a.780,500 is less than 880,500.
b.780,500 is greater than 880,500.
c.880,500 is greater than 950,100.
d.880,500 is less than 780,500

i think is 3 and 6. this took me 10 min to think.hope to and hope that my answer is brainliest.(follow me )

correct choice is b

step-by-step explanation:

when you calculate the average rate of change of a function, you are finding the slope of the secant line between the two points. for the function the average rate of change from point to point can be calculated as

to find the average rate of change from day 2 to day 10, note that at day 2, 8 houses were sold, so a(2,8) and at day 10, 2 houses were sold, so b(10,2). thus,