Solve algebraically.
3x + y =3
y = 2x - 7

3.5%

Step-by-step explanation:

To calculate the percent error, subtract the expected value from the actual value, divide by the expected value, take the absolute value, and then multiply by 100%.

Percent error = |actual value - expected value ÷ expected value| × 100%

= |16.6 - 17.2 ÷ 17.2| × 100%

= |-0.6 ÷ 17.2| × 100%

= |-0.0348837209302326| × 100%

= 0.0348837209302326 × 100%

= 3.488372093023256% → 3.5% (to the nearest tenth)

Hope that helps.