Multiplying a vector by a scalar means to multiply each coordinate of the vector by said scalar.
So, we must multiply both entries by 7:

No, in order for the lines to be parallel, the slopes have to be the same, it does not matter what the slopes are as long as they are the same slope. The lines could still be parallel if the slopes are negative.
There are three possible results when a plan intersects with a three-dimensional figure and these are:
a point
a line
a plane
The first step in describing the result is to determine first how the plane and the figure intersects.
One ton = 2000 lbs
Therefore, 1.5 tons = 3000 lbs
3000-300=2700lbs