Jonah received $300 in cash gifts for his fourteenth birthday. The function y=300-25x describes the amount y remaining after x weeks if Jonah spends $25 each week . Graph the function and determine the amount remaining after 9weeks?

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Answer 1 · 2018-02-02T21:06:21

See a solution process below:

First, two graph the function we need to solve this for two values of the function. We can use #x = 0# and #x = 4#

For: x = 0

#y = 300 - (25 * 0)#

#y = 300 - 0#

#y = 300# or #(0, 300)#

For: x = 4

#y = 300 - (25 * 4)#

#y = 300 - 100#

#y = 200# or #(4, 200)#

We can graph these two points and draw a line through it showing the function:

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We can see from the graph, at week 9 there will be $75 remaining.

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