Solve the following systems of equations below 1.y=x+7, y=-1/2x+4
2.y=-1/5x-3,y=x+3
3. y=-1/2x+3,3x-2y=10
4. y=-x+5,2x-y=7
Determine if the following has no solutions, infinitely many solutions, or exactly one solution below.
1.6x+y=-5,30x+5y=-20
2. x+y=5, -5x-4y=-18
3. x+y=3, -x-y=-3

cant

step-by-step explanation: there is no picture

3 3 6, because in every triangle the longer side is always shorter than the sum of the other two

answer: the proof is mentioned below.

step-by-step explanation:

since, given:   lines bc = ef

prove:   lines ac > ef

          statements                                           reason

1. bc=ef                                           1. given

2. ac= ab+bc                                 2. because b is the point between the  

                                                            line segment ac

3.   ac > bc                                       3. because if a line segment is equal to

                                                          the sum of two line segments then it is

                                                          always greater then each of these

                                                          individual line segments

4. ac > ef                                         4. by equality property.