Brian is a software salesman. Let y represent his total pay (in dollars). Let x represent the number of copies of “Math is Fun” he sells. Suppose that x and y are related by the equation y=2300+110x. Answer the questions below.

Note that a change can be an increase or a decrease.
For an increase, use a positive number. For a decrease, use a negative number.

1. What is the change in Brian’s total pay for each copy of “Math is fun” he sells?
$__

2. What is Brian’s total pay if he doesn’t sell any copies of “Math is fun”?
$___

Step-by-step explanation:

when x=0, y=1600

when x=1, y=1670

each copy is a change of 70 dollars

when he doesn't sell any copies (x=0), he earns 1600 dollars

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, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for