Need

what is the coefficient of y in the expression 2 ⋅ 4 + 3y?

a.2
b.3
c.7
d.8

How do you use the elimination method for this question? explain, because i really want to understand!

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

At the olympic games, many events have several rounds of competition. one of these events is the men's 100-meter backstroke. the upper dot plot shows the times (in seconds) of the top 8 finishers in the final round of the 2012 olympics. the lower dot plot shows the times of the same 8 swimmers, but in the semifinal round. which pieces of information can be gathered from these dot plots? (remember that lower swim times are faster.) choose all answers that apply: a: the swimmers had faster times on average in the final round. b: the times in the final round vary noticeably more than the times in the semifinal round. c: none of the above.