Question 772497
Parallel lines and their slopes are easy. Since slope is a measure of the angle of a line from the horizontal, and since parallel lines must have the same angle, then parallel lines have the same slope — and lines with the {{{same}}}{{{ slope}}} are parallel.

this line  {{{y=(1/2)x+3}}} has a slope {{{m=-(1/2)}}}; so, any other line with same slope will be parallel to this line