Answer
a. $0.8+0.45x=y$
b. $2.6+0.15x=y$
c. $x=6, y=3.5$
Work Step by Step
The function that models the average number of symptoms after $x$ years is the initial average number of symptoms plus the rate at which the symptoms are increasing times the week.
a. $0.8+0.45x=y$
b. $2.6+0.15x=y$
c. When the average number of symptoms is equal that means that the $y$ is equal.
$0.8+0.45x=2.6+0.15x$,
$0.45x-0.15x=2.6-0.8$,
$0.3x=1.8$,
$x=6$. when $x=6$, $0.8+0.45(6)=y$,
$y=3.5$
