Question

On a science test, 2 points are deducted from a total of 100 points for each question answered incorrectly. Trevor scored an 84 on the test. The equation 100−2x=84, where x represents the number of questions answered incorrectly, represents the situation. How many questions did Trevor answer incorrectly?

Answer 1

Trevor answered 8 questions incorrectly.

Explanation:

You need to isolate the variable. Subtract 100 from each side. Now you have -2x=-16. Divide each side by -2 and you are left with x=8.

Answer 2

12

Explanation:

100-84=24

24/2=12