Answer:
B. 5
Step-by-step explanation:
The code can either be Single letters or 2 letter in alphabetical order
single letter coder are
A
B
C
D
The two letter code are
AB
AC
AD
BA
BC
BD
CD
That is, a total possibility of 10 code which means 4 is not going to work
When E is added then we have AE, BE and the rest . The possibility will be more than 12 so if we have 5 letter then we will have more than enough which means 5 is the answer
Answer:
(using substitution to solve the problem)
x=y-3
2x+y=12
2(y-3)+y=12
2y-6+y=12
3y=18
y=6
y=6
x=6-3
= (3, 6)
Step-by-step explanation:
using substitution, substitute the x in the second equation to y-3, to find the value of y. after that distribute the 2 into the parenthesis and collect like terms. once you simplify, you have the value of y, so substitute the value of y into the first equation to find x. once you have both values put them in the ordered pair form and you're done.
i hope this helps :)
Use the distributive property:
And