Jenna found three solutions to linear equation. she graphed them, but they don't lie in a straight line. what errors could jenna have made? explain.

A system of linear equation could only have 1 solution. This is because the straight lines will only have to meet, cross, or intersect each other once. 

There are many different methods in arriving to the final answer. However, errors cannot be perfectly avoided. One of these errors to mistakenly identify equations as linear. It is important that we know that the equations we are dealing with are of exact or correct  characteristics. 

Also, if she had used substitution method, she might have mistakenly taken the value of one variable for the other.