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Sergeu [11.5K]
3 years ago
12

Rooter Plus charges a $25 service fee plus $40 per hour of work done. Is this a proportional or non-proportional relationship?

Mathematics
1 answer:
Dominik [7]3 years ago
5 0

Answer:

Non-proportional; the rate of change is $40/hour

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a proportional variation if it can be expressed in the form y/x=k or y=kx

In a proportional relationship the constant of proportionality k is equal to the slope m of the line <u>and the line passes through the origin</u>

Let

x -----> the number of hours

y ----> The total charge in dollars

The equation of the line in slope intercept form is equal to

y=mx+b

where

m is the slope

b is the y-intercept

we have

m=40\ \$/h\\b=\$25

substitute

y=40x+25

This relationship is not proportional, because the line not passes through the origin

therefore

Non-proportional; the rate of change is $40/hour

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4) A bank is offering 3.5% simple interest on a savings account. If you deposit
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Answer:

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Gloria deposited $500 into a bank account that earned 7.5% simple interest each year. She earned $225 in interest before closing
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t = (1/r)(A/P - 1)
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