Just a reminder that, for many of the same reasons that you’re hitting, trying to exactly match latex that students have entered will be frustrating and unreliable for them as well. Things like -1+1/3x, 2/6x-1, or even putting a space somewhere in the equation will cause correct responses to be marked as wrong. Checking if the equation passes through the right points using simpleFunction(), or using xyLine() to check the slope and intercept will help make this a much better experience for your students.