3. Two lines or equations are described in each part. Decide whether each system has one solution, no solution, or infinitely many solutions. Show your work or explain your reasoning.
(a) Line a has a rate of change of 7.
Line b has a rate of change of - 7
(b) 2x+3y=5.5
4x+6y+11
(c) Line c and line d are parallel
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