Need the answers quick

43, 45, 36

Step-by-step explanation:

2a

43+x+x+51=180 [Sum of angles of a triagle]

2x=180-43-51

x=86/2

x=43

2b

x+90=135 [The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles of the triangle]

x=45

2c

x+2x=108 [The measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles of the triangle]

3x=108

x=108/3

x=36

5x+2x=49

7x=49

x=7. 35 apples

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