Use back-substitution to solve the system. 13. -x + 14. x - y - z = 0 2y + z = 3 zz = 0 y = 4 2y + z = 6 3z = 6

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

Ataxi company charges $2.25 for the first mile and then $0.20 per mile for each additional mile, or f = $2.25 + $0.20(m - 1) where f is the fare and m is the number of miles. if juan's taxi fare was $6.05, how many miles did he travel in the taxi? if juan's taxi fare was 7.65, how many miles did he travel in taxi

Ageologist had two rocks on a scale that weighed 4.6 kilograms together. rock a was 0.5 of the total weight. how much did rock a weigh?