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The pair of equations y = 0 and y = -7 h...

The pair of equations `y = 0` and `y = -7` has

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Graphically y = 0 is a straight line which is x - axis and y = - 7 is a straight line parallel to x - axis, 7 units below the origin therefore lines y = 0 and y = - 7 are parallel.
`therefore` They have no solution.
(because solution is the intersection point of both the lines).
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