4. which expression is equivalent to 3(x+6)?
a
3+x+3+6
c
3+x+6
b
3x +6
d
3x +18

D

Step-by-step explanation:

Cmon man, your not even trying.

3(x+6) is x+6+x+6+x+6 or 3x + 3(6).

That simplified is 3x + 18

answer: i guess 105 degrees?

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