The linear combination method gives a solution of (-4, 2) for which of these systems of linear equations?

3x+ 13y 14
Bx+11y-2

4x+5y - 12
Bx+3y=-4

5x+4y - 12
7x+8y - 12

10x+3y-B
17x+By – 10

Barbara's piano instructors house is 7 1/8 miles from her house. after biking for 1 3/4 miles she stops to rest how much longer does she need to bike to reach her instructor's house

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.

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x