Zachary purchased a computer for $1 200 on a payment plan. Two months after he purchased the computer, his balance was $920. Five months after he purchased the computer, his balance was $500. What is an equation that models the balance y after x months? Write in slope intercept form.

Question

Mathematics

Leilani Beasley

25 September, 23:56

Zachary purchased a computer for $1 200 on a payment plan. Two months after he purchased the computer, his balance was $920. Five months after he purchased the computer, his balance was $500. What is an equation that models the balance y after x months? Write in slope intercept form.

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Answers (1)

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Chasity Riley · Answer 1

Y=kx+b.

for this question.

920=2k+b (function 1)

500=5k+b (function 2)

use function 2 - function 1, we get

-420=3k

k=-140

back to function 1

920=2 * (-140) + b

b=920+280

b=1200

Thus, y=-140x+1200