The answer is written to the right of each problem. The professor taught us the steps were 1) intercepts, 2) inverse, 3) reduce fractions. I dont understand how he got that. I have troubling seeing the intercepts

(4) Determine the indices for the directions and/or planes shown in the following unit cells (4) Note write steps by step procedure for calculating indices! Z (121) (101) A4 (4) Determine the indices for the directions shown in the following unit cells. Note write steps (5) by step procedure for calculating indices