Which ordered pair is not a solution to y=2x+5

a. (2,9)
b. (5,15)
c. (3,13)
d. (4,13)
answer fast need this right now me

y=2x+5

A. (2,9)
9 = 2*2 + 5
9 = 4 + 5
9 = 9   yes 

B. (5,15)
15 = 2*5+5
15 = 10+5
15=15   yes

C. (3,13)
13 = 2*3 + 5
13 = 6 + 5 
13 ≠ 11   no

D. (4,13)
13 = 2*4 + 5
13 = 8 + 5
13 = 13 yes

pair C. (3,13) is not a solution to y=2x+5

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.