Question

answer
$c = \square$
the $y$-intercept of the function is $\square$ which represents
the initial charge to use a computer
the additional charge per minute
the total charge of using a computer
the number of minutes the computer was used

Explanation:

Step1: Identify y-intercept

The y-intercept is the value of $C$ when $x=0$, which is 4 from the graph.

Step2: Calculate slope (rate per minute)

Use two points: $(0,4)$ and $(5,9)$. Slope $m=\frac{9-4}{5-0}=1$.

Step3: Write linear function

Use slope-intercept form $C=mx+b$, where $m=1$, $b=4$.
$C = x + 4$

Step4: Interpret y-intercept

The y-intercept is the initial cost when $x=0$ (0 minutes used).

Answer:

$C = x + 4$
The y-intercept of the function is 4 which represents the initial charge to use a computer