# Chapter 4 - An Introduction to Functions - Pull it All Together - Page 280: Task 3B

The function would be y=2x+180 as the amount of string would be dependent on the necklace length. The graph of function is shown below.

#### Work Step by Step

The equation was created using system of equation. y=mx+b. 2 points-->(10,200) (11,202) 1. (200=10m+b) $\times$-1 2. 202=11m+b. -200=-10m-b 2=m 200=2(10)+b 200=20+b b=180 Therefore the function rule is y=2x+180

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