What is the equation of the line that goes through (3,11) and is parallel to the line 2x-y=5

The equation is y=2x+5

why?

2x-y=5

y=2x-5

from here we can find the slope, which is 2, and we know that parallel lines have equal slopes

the standard form of eq of line is y=mx+b

substitute y and x with the numbers from ordinate pair (3,11):

11=3*2+b

6+b=11

b=5

Now you can write the eq of line:

y=2x+5