Solve by elimination 2x + 5y = 10
3x -5y = -35

6x +2y = 8
6x +4y = 28

4x + y = 9
y= -4x +12

21x +7y = 14
-7y = 10 - 3x

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Asequence {an} is defined recursively, with a1 = 1, a2 = 2 and, for n > 2, an = an-1 an-2 . find the term a241. a) 0 b) 1 c) 2 d) 1 2

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.