I go to the store to buy school supplies. I spend $8.52. I buy one notebook $2.55 and three pens which are each the same price. What is the price of a pen?

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Answer 1 · 2018-05-09T01:15:32

The price of the pen is $1.99

Notebook = x
Pen = y

Formula

Cost = x + 3y

if you know that the total cost is $8.52 and that the notebook cost $2.55, you can solve the question like so:

$$8.52 = $2.55 +3y$

$$8.52 - $2.55 = 3y$

$($5.97)/3 = y$ --> cancels the 3

$1.99 = y

Answer 2 · 2018-05-09T01:25:13

The price of one pen is $$1.99$ .

Let's list out what we know:

One notebook $= $2.55$

3 pens $=$ unknown price

Total spent $= $8.52$

Let's let the price of one pen be $p$ . Now we form an equation to solve for $p$ :
$2.55 + 3p = 8.52$

Subtract $color(blue)2.55$ from both sides:
$2.55 + 3p quadcolor(blue)(-quad2.55) = 8.52 quadcolor(blue)(-quad2.55)$

$3p = 5.97$

Divide both sides by $color(blue)3$ :
$(3p)/color(blue)3 = 5.97/color(blue)3$

$p = 1.99$

Therefore, the price of one pen is $$1.99$ .

Hope this helps!