Which pair of triangles must be similar? Triangles 1 and 2 each have a 35º angle.
Triangles 3 and 4 are both isosceles. They each have a 40º angle.
Triangle 5 has a 30º angle and a 90º angle. Triangle 6 has a 30º angle and a 70º angle.
Triangle 7 has a 50º angle and a 25º angle. Triangle 8 has a 50º angle and a 105º angle.

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

a

step-by-step explanation:

the answer is a

s

step-by-step explanation:

2: 10

step-by-step explanation: