What is the axis of symmetry of y equals x squared plus 4x minus 5

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

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Which letters from the table represent like terms? a and b b and c a and d b and d