Teachers are being trained to standardized the scores they give to students' essays. the same essay was scored by 10 different teachers at the beginning and at the end of their training. the results are shown in the tables.

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

d

because parallelagram have all 4 angels the same size dependeing and a rectangle and square are oth parallelogram

answer: it is 8

step-by-step explanation:

you know why its 8