XyStories accepts all correct steps. It checks each step, knows synonyms and can always suggest a reasonable next step. Below, four students need help in solving a simple mixture problem.

A. After this student enters two correct expressions, xyStories uses underlining to “explain” its suggested equation:

B. This student begins differently and xyStories suggests using the sum of the weights to obtain an equation:

C.1. This student describes a second quantity in a correct but unexpected way, and xyStories suggests an equation by cleverly noticing that both expressions represent the same quantity:

C.2. If asked, xyStories then helps the above student begin solving this unexpected equation:

D.1. This student uses two variables and xyStories underlines relevant items when suggesting an appropriate second equation:

D.2. If asked, xyStories then shows a good way to begin solving this particular system of equations: