Yes, as long as the negative slopes are both equal.
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Yes. My Dad told me it is still negative.
Yes.
Parallel lines are lines which share the same gradient. In Euclidean geometry (the geometry used in standard mathematics and day-to-day physics), parallel lines will never meet at a point, but will share every point along their (infinite) lengths if 1 point is observed to coincide with both. The parallel postulate, which is a geometric axiom of Euclid's geometry, defines these properties. However, by moving into elliptical and hyperbolic geometries, parallel lines can be allow to intersect at points (where parallel lines are defined as 2 lines having the same gradient), whilst still retaining logically consistent geometrical definitions. Parallel lines are the opposite of perpendicular lines which meet at right angles.
That would be negative three. A negative multiplied by a negative is a positive. A negative multiplied by a positive is still a negative.
A negative plus a negative still gives a negative answer.