Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to use cramer's rule [title] Know the naming convention. [step] In a set of three equations, say 1 , 2 and 3, name the coefficients of the equation 1 as: a1, b1, c1. Name the constant term as d1.

Ending1: Continue the correlations, while registering each coefficient in the equation. [substeps] For instance, the first coefficients of a1 and b1 are eliminated from the equation. Ending2: If you define these as " theorems ", the answer will be printed on the notebook. With each variation, you solve the problem in the same way, with one variable representing another (b1, b2). Ending3: Similarly, name the coefficients of equations 2 and 3 as: a2, b2, c2 and a3, b3, c3 with their constant terms being d2 and d3 respectively. [title] Arrange the coefficients in a 3x3 matrix named d. Ending4: An answer based on the number of sub-equations equal to 4 and 2, g1. By placing the coefficients of the formula, write the coefficients on both sides of the equation.

Answer format: ending1/ending2/ending3/ending4