Can someone please help me with 1,2 please

1) This HAS a right angle

2) This is an obtuse triangle

Step-by-step explanation:

1)

4² + 3² = 5²

16 + 9 = 25

25 = 25 ✅

2)

5² + 6² = 8²

25 + 36 = 64

61 ≠ 64 ❌

Since c is bigger, this is an obtuse triangle

00

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