Julie needs to cut 4 pieces of yarn, each with the same length, and a piece of yarn 7.75 inches long. Let [tex]x[/tex] represent the length of each of the equal pieces of yarn that Julie decides to cut. What is the equation that can be used to determine the total length of all of the yarn that she ends up cutting, [tex]y[/tex]? Is the graph of the equation continuous or discrete?

A. [tex]y = 7.75x + 4[/tex]; discrete
B. [tex]y = 7.75x + 4[/tex]; continuous
C. [tex]y = 4x + 7.75[/tex]; discrete
D. [tex]y = 4x + 7.75[/tex]; continuous



Answer :

Certainly! Let's break down the problem step-by-step to find the correct equation and determine if the graph is continuous or discrete.

1. Understanding the Variables and Constants:
- Let [tex]\( x \)[/tex] represent the length of each of the 4 equal pieces of yam that Julie is cutting.
- The length of the yarn is given as 7.75 inches.
- [tex]\( y \)[/tex] is the total length of all the yam pieces combined.

2. Formulating the Equation:
- Julie cuts 4 pieces of yam, each with the same length [tex]\( x \)[/tex].
- Therefore, the total length of the 4 pieces of yam is [tex]\( 4 \times x \)[/tex].
- Adding the length of the yarn (7.75 inches), the total length [tex]\( y \)[/tex] can be expressed as:
[tex]\[ y = 4 \times x + 7.75 \][/tex]

3. Identifying Continuity:
- In this context, [tex]\( x \)[/tex] can be any non-negative real number because lengths can vary continuously.
- Therefore, the equation [tex]\( y = 4 x + 7.75 \)[/tex] charts a continuous relationship between [tex]\( x \)[/tex] and [tex]\( y \)[/tex].

Given these explanations, the correct answer is:
[tex]\[ y = 4 x + 7.75; \text{ continuous } \][/tex]