\begin{aligned} &y=2x +1 &x-y=-3 \end{aligned}

y=2x+1
x−y=−3


Is (2,5)(2,5)left parenthesis, 2, comma, 5, right parenthesis a solution of the system?
Choose 1
Choose 1

(Choice A)
A
Yes

(Choice B)
B
No

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?