Matrix size
One equation per line, like 2x + 3y = 5. Use any letters as variable names, put terms on either side, and fractions such as 1/2x are fine. This panel stays open until you close it.
One row per line, values separated by commas or spaces. Fractions like 3/4 are accepted. This panel stays open until you close it.
Values
Whole numbers, decimals and fractions all work. Arrow keys move between cells.
Second operand
Summary
Determinant
0