A 15 foot ladder is used to scale a 12 foot wall. At what angle of elevation must the ladder be situated in order to reach the top of the wall? Round to the nearest degree.

The angle of elevation must be??

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

alright well the answers to your question is

2xy/9 hope this have a nice day : )

step-by-step explanation: