Without graphing,tell whether the graphs of the system of equations are parallel,perpendicular,intersecting or coinciding.
1.)y=x+7 and y=-x+2
2.)y=5x and y=5x-1
3.)2x+y=1 and 2y+4x=2
4.)y=2x+3 and y=-x-4
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Answer:
1.Perpendicular
2.parallel
3.coinciding
4.intersecting