A number is selected at random from the set {2,3, 4, ... 10). Which event, by definition, covers the entire sample space of this experiment?
A.
The number is greater than 2.
The number is not divisible by 5.
OB.
C.
The number is even or less than 12.
D.
The number is neither prime nor composite.
E.
The square root of the number is less than 3.

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

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116

i think it might be a but you might want a second opinion

my guess would be b and d, but i didn’t actually get out the pen and paper. lol