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Lyrx [107]
3 years ago
14

Braden bought 18 pencils for $4.50.

Mathematics
2 answers:
tankabanditka [31]3 years ago
4 0
<h2>Answer</h2>

To graph the line of the proportional relationship you should plot the points (0, 0) and (18, 4.5), and then join the points with a line.

<h2>Explanation</h2>

Notice that is pretty obvious that 0 pencils cost 0 dollars, so our fist point will be (0, 0). Since x represent the number of pencils purchased and y the total cost, our second point will be (18, 4.5)

Now we can find the slope of our line using the point slope formula:

slope formula:


m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}


where  

m is the slope of the line


(x_{1},y_{1}) are the coordinates of the first point on the line


(x_{2},y_{2}) are the coordinates of the second point

Since we already have our two points, we can replace the values in our formula:

m=\frac{4.5-0}{18-0}


m=\frac{4.5}{18}


m=\frac{4.5-0}{18-0}


m=0.25

Now that we have our slope, we can use the point slope formula to complete the equation of our line:

y-y_{1}=m(x-x_{1})

y=0.25x

Now, to graph the line that represents the proportional relationship, we will join the points (0, 0) and (18, 4.5) using our line.

Rashid [163]3 years ago
3 0
(18,4.50) is the porportion relationship.
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