Which sentence correctly uses commas to separate the elements of an address?
a. the university club library is located at 1 west 54th street, new york, new york.
b. the university club library is located at 1 west, 54th street, new york, new york.
c. the university club library is located at 1 west 54th street new york, new york.
d. the university club library is located at 1 west 54th street, new york new york.

In an address, a comma should be placed after the street and between the city and state. Also, the place number and the street should not be separated by a comma, nor the state and zip code, in case there is any.

Therefore, the sentence that correctly uses commas to separate the elements of an address is a. The University Club Library is located at 1 West 54th Street, New York, New York.

x=4, y=4

step-by-step explanation:

y=2x-4;

x+2y=12

we can use substitution since the first equation is solved for y

where ever you see y in the second equation, replace it with 2x-4

x + 2(2x-4) = 12

distribute the 2

x+4x-8 = 12

combine like terms

5x-8=12

add 8 to each side

5x-8+8=12+8

5x=20

divide by 5

5x/5 = 20/5

x =4

we still need to solve for y

y = 2x-4

we know x =4

y = 2(4) -4

y = 8-4

y=4