Answer:
A) 80
Step-by-step explanation:
This is the RSM answer
wow u asked this in 2018
anyone else from RSM...
it is (A)
The newspapers did she sell at $.25 at 80. If in the linear equation one variable is present then the equation is known as the linear equation in one variable.
It is defined as the relation between two variables if we plot the graph of the linear equation we will get a straight line.
The given data in the problem is;
The cost for one newspaper is $.25
The cost for other newspapers is $.40
The cost at which the 100 newspapers sold was $28.00
x is the number of the newspaper sold at $.25
y is the number of the other newspaper
The sum of both the newspaper is 100
x+y=100
y=100-x
[tex]25x+40y=28.00 \\\\ 25x+40(100-x)=2,800\\\\ 25x+4,000-40x=2,800\\\\ -15x+4,000=2,800 \\\\-15x=-1,200\\\\\ x=80[/tex]
Hence newspapers did she sell at $.25 at 80.
To learn more about the linear equation refer to the link;
brainly.com/question/11897796
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