Tomas is planning a rail trail using a map with a marked grid. the head of the trail, which has a guide booth, is at (3, 0). he moves 1 unit east and 3 units north and places a pin at (4, 3) to mark the location of another guide booth. he continues placing pins so that each pin is 1 unit east and 3 units north of the previous pin. which of the following points will have pins? select all that apply. a coordinate plane has an x-axis labeled east from 0 to 10 in increments of 1 and a y-axis labeled north from 0 to 10 in increments of 1. a. (5, 6) b. (6, 8) c. (7, 10) d. (8, 17) e. (9, 18) f. (10, 21)