It is difficult to tell because there is no equation - just two expressions.
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The slope is 5.
5
It is: 5
If you mean: y = -5x then the slope of the line is -5 and there is no y intercept
27
y - 5x is an expression, not an equation. As a result, it cannot describe a line.
The equation of: y = 5x-3 would satisfy the given conditions.
6
15
9.5
That depends what else is given, but basically you must find another line that has the same slope. For example, in y = 5x + 3, 5 is the slope; any other line with the same slope is parallel, for instance, y = 5x + 10, or y = 5x - 2.
If you mean: y = 5x-2 then the perpendicular slope is -1/5