Question

Betty is having invitations printed for a holiday party. It costs $3.90 to set up the printing machine and $2.44 per invitation. In the equation below, x represents the number of invitations Betty is having printed, and y represents the cost to print the invitations.

y = $2.44x + $3.90

How much will it cost Betty to print 100 invitations?
A.
$392.44
B.
$251.80
C.
$103.90
D.
$247.90

Answer 1

D) $247.90

Explanation:

Understanding the equation:

`\underline{\sf{y = 2.44x + 3.90}}`

y is the dependent function whereas x is the independent function.

(What does this mean?)

The values of y depend on the values of x, I.e., any change in the value of x causes a change in the value of y, meanwhile, the opposite doesn't happen.

• x represents the number of invitations
• y represents the cost to print the invitations

The cost to print the invitation depends on the number of invitations, for real.

Solution to the problem:

The question asks us to find the cost of printing 100 invitations.

Substituting x for 100:

y = (2.44 × 100) + 3.90

y = 244 + 3.90

y = 247.90

Answer:

The value of y obtained for x = 100 is the cost of printing 100 invitations – $ 247.90