Question

The table shows how the interest earned by a savings account depends on the amount of money in the account.


Amount of Money in Account
Interest
Earned
$100 $3
$200 $6
? $12
$1500 $45
$5000 $150
What value is missing from the table?
A. $400
B. $500
C. $600
D. $300

Answer 1

from the first 2 points, you can tell that doubling the money in the accound also doubles the interest, it is a line

so doubleing 3 dollars in interest, doubles the 200 dollars in money invested

Answer 2

6 doubled is 12
200 doubled is 400

Answer 3

Ok I see how that works. You basically double both your values?

Answer 4

yeah, there is the same ratio between a change in amount in the account, and the interest earned

Answer 5

the slope of a line

Answer 6

are you expected to know how to write the equation for the line from a table of values like this?

Answer 7

no.

Answer 8

they just wanted to know the answer.

Answer 9

ok, that would be the easiest we to explain it. THen you just use the value of 12 in your equation and it will give you 400 as the output

Answer 10

Ok thanks :D