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To compute the cost of each mechanical pencil, we need to subtract the cost of the erasers from the total amount that Mr. Spears had to spend.
The equation to compute the cost of each mechanical pencil is:
X + 0.50 = 25 - (10 * 0.50)
First, let's calculate the cost of the erasers: (10 * 0.50) = 5
Now, let's substitute the value into the equation:
X + 0.50 = 25 - 5
Simplifying further:
X + 0.50 = 20
Subtracting 0.50 from both sides of the equation:
X = 20 - 0.50
X = 19.50
Therefore, the cost of each mechanical pencil is $19.50.