Need

write an equation using the triangle sum theorem.

x = 29

Step-by-step explanation:

Note that the angle sum of a triangle adds to 180 degrees. So, this gives us a neat expression for x.

3(x + 2) + 35 + 52 = 180 (angle sum of a triangle)

3x + 6 + 35 + 52 = 180

3x + 93 = 180

3x = 87

x = 29.

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