Question

Jessica is a software saleswoman. Let y represent her total pay (in dollars). Let x represent the number of copies of Math is Fun she sells. Suppose that x and y
are related by the equation 110x+1800=y.
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.
What is the change in Jessica's total pay for each copy of Math is Fun she sells?
$
What is Jessica's total pay if she doesn't sell any copies of Math is Fun?

Answer 1

Jessica's total pay if she doesn't sell any copies of Math is Fun is $1800

Equation

Let

• total pay = y
• number of copies of Math is Fun she sells = x

110x + 1800 = y

change in Jessica's total pay for each copy of Math is Fun she sells?

• Assume 10 copies are sold

110x + 1800 = y

110(10) + 1800 = y

1100 + 1800 = y

$2900 = y

Assume 11 copies are sold

110x + 1800 = y

110(11) + 1800 = y

1,210 + 1800 = y

y = $3,010

Jessica's total pay if she doesn't sell any copies of Math is Fun?

110x + 1800 = y

110(0) + 1800 = y

$1800 = y

Therefore, the change in Jessica's total pay for each copy of Math is Fun she sells, assuming 10 and 11 copies are sold respectively is $110

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