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Mathematics 18 Online
OpenStudy (anonymous):

plz help no one is .. question below

OpenStudy (anonymous):

A school system is reducing the amount of dumpster loads of trash removed each week. In week 5, there were 60 dumpster loads of waste removed. In week 10, there were 40 dumpster loads removed. Assume that the reduction in the amount of waste each week is linear. Write an equation in function form to show the amount of trash removed each week. f(x) = - 4x + 60 f(x) = 4x + 60 f(x) = - 4x + 80 f(x) = 4x + 80

OpenStudy (anonymous):

@mathstudent55 plz help

OpenStudy (anonymous):

@sleepyjess help :(

OpenStudy (sleepyjess):

Just substitute in the numbers and see which one works out. x = 5, y = 60 x = 10 y = 40

OpenStudy (anonymous):

i still don't get it

OpenStudy (anonymous):

i got choice a the first time i did it

OpenStudy (sleepyjess):

Substitute in 5 for x in the first equation. y = -4(5) + 60 y = -20 + 60 y = 40 Welp, week 5 is supposed to be 60, so the first option isn't right.

OpenStudy (anonymous):

oh i see give me a sec

OpenStudy (anonymous):

so it's C?

OpenStudy (sleepyjess):

Yep, that works with both values of x y = -4x + 80 y = -4(5) + 80 y = -20 + 80 y = 60 That works y = -4x + 80 y = -4(10) + 80 y = -40 + 80 y = 40 That works too

OpenStudy (anonymous):

OK thnz

OpenStudy (sleepyjess):

np

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