Which changes in surface water movement are likely to occur when
vegetation (plants) is removed from the side of a hill?
A) infiltration decrease and runoff decrease

B) infiltration decrease and runoff increase

C) infiltration increase and runoff decrease

D) infiltration increase and runoff increase

my best answer is D

Step-by-step explanation: plant keep the soil in place to decrease runoff and infiltration

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