The solution to a system works out to a value such as 11 over 2. Why is reading it off a drawn grid a poor way to find it?

1. Drawing works well when the crossing lands on a whole-number grid line, since the eye can read it off exactly. 2. A value such as 11 over 2 falls between two grid lines, so the reading becomes a guess. 3. Substitution or addition gives the exact value instead, which is why those methods exist. 4. Options B and C are simply untrue, since fractional points can be plotted and lines cross at them often. 5. So the trouble is the accuracy of the reading, option A. _Source: OpenStax College Algebra (CC BY 4.0), Ch 7 "Systems of Equations and Inequalities", section 7.1 Systems of Linear Equations: Two Variables_