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It depends what the problem is. If the graph of the problem has hours on the x axis, and amount in dollars on the y axis, and the title is 'Renting Movies', then the slope in the context is the amount of money per hour to rent a movie.
Without an equality sign the expression given can't be considered to be a straight line equation. But if you mean: 5y = -7x then the slope is -7/5 or as -1.4
X=5 is a vertical line, so it has no slope. When I say it has no slope, I don't mean the slope is 0, I mean the slope is nonexistent.
The number shows how steep it is, the sign is whether it is going up or coming down. So 2 is a slope upwards and -3 is a steeper slope down
-3