Question

representing proportional relationships
the table represents the total cost for various numbers of photo prints from a local company print pros. write an equation to represent the situation.
$y=kx$
$k=\frac{y}{x}$
$k=\frac{1.5}{10}=.15$
prints (x) cost (y)
10 $1.50
15 $2.25
20 $3
50 $7.50
multiple-choice question
since k is .15, what is the equation for the table?
$y=1.5/10x$
$y=.15x$
$y=15x$
rewatch

Explanation:

Step1: Recall proportional formula

Proportional relationships follow $y=kx$, where $k$ is the constant of proportionality.

Step2: Confirm given $k$ value

The problem states $k=0.15$.

Step3: Substitute $k$ into formula

Replace $k$ in $y=kx$ with $0.15$, so $y=0.15x$.

Answer:

$y=.15x$