Agroup of tourists went on three hikes with a distance of 12.5 km, 18 km, and 14 km. their speed on the first hike was 1km/hour slower than their speed on the second hike and 1 km/hour faster than their speed on the third hike. the third hike took 30 minutes longer than the second hike. how long did all three hikes take?

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

idk

step-by-step explanation:

asdasdsad

step-by-step explanation:

not sure but it may be b, as i said i'm not sure.