Determine whether each ordered pair is a solution of the system of linear equations. An oversized left curly brace.
2x−y=4
x+9y=21
a. (3,2)
b. (6,8)
a. Is (3,2) a solution?

Yes
no

With this question! what is process of elimination? ? p.s. my brothers acc got banned so add his new one @ yamauchiyamyam17

Which of the following are accepted without proof in a logical system? check all that apply.

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling