SOLUTION: SELLING CALCULATORS Last month, a bookstore ran an ad for calculators on sale; graphing calculators for $87 and scientific calculators for $18. Sales of $4980 were generated, wit

Question 95395This question is from textbook Intermediate Algebra
: SELLING CALCULATORS Last month, a bookstore ran an ad for calculators on sale; graphing calculators for $87 and scientific calculators for $18. Sales of $4980 were generated, with 15 more graphing calculators sold than the scientific calculators. How many of each type of calculators did the bookstore sell? This question is from textbook Intermediate Algebra

Answer by sweets420(1) (Show Source): You can put this solution on YOUR website!
First we need to make "X" the number of scientific calculators
Second X+15 will equal the total of graphing calculators.
the scientific calculator is $18 so you want to multiply that by X
the graphing calculator is $87 you will want to multiply 87 times x+15
Set up the equation like this:
equation set up
$18x + $87(x+15) = $4980

first do the multiplication $87(x+15)
$18x + ($87x + $1305) = $4980

now add the to variables $18x and $87x
$105x + $1305 = $4980

now you want to get the variable on one side by itself so you need to subtract $1305 from both sides
$105x - $1305 = $4980 - $1305

Now you need to divide both sides by the variable 105x
105x = $3675

105x = $3675
____ _____
105 = 105
x = 35

35 is the total number of scientific calculators

Now you need to add the total of scientific calculators to 15
35 + 15 = 50 50 is the total of graphing calculators

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