Guided Practice Solve the system using substitution.
a=b−3
a=2b−18

A.
(,​ 9)

B.
(,​ 6)

C.
(2,​ 12)

(10, –1)

Step-by-step explanation:

[1]3y=−12x+2

[2]y=−x+9

While it is not technically necessary, I find it easier to clear the fractions before actually beginning; so multiplying [1] by 2

[3]6y=−x+4

Substituting (from [2]) (−x+9) for y in [3]

[4]6(−x+9)=−x+4

Simplifying

[5]−6x+54=−x+4

[6]5x=50

[7]=10

Substituting (from [7]) 10 for x in [2]

[8]y=−10+9=−1

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

all the angles opposite to the angle 150 would be 150 and all the angles that are next to 150 are 30 because they equal 180 it you add it up.

step-by-step explanation: