Which of the following triangles is not possible? A = 75o , 15o , 90o

B = 90o , 30o , 60o

C = 60o, 60o, 60o

D = 100o, 45o, 45o

100, 45, 45

Step-by-step explanation:

45 + 45 is 90 not 80 for 180

srry idk

step-by-step explanation:

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