order of operation
1) --[-3÷3])+20
2) -27+(-12)(10)+4•[-3-16]
3) (-)-13(-26÷[-13])
4) -10+(-2)(13)-7(-2-1)
it would mean the world

1) 3

2)-223

3)-4

4)-15

Step-by-step explanation:

i think it is c, not positive though

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