Hello! I'm kind of new to this forum, and I hope I'm posting in the right category. My school calls the class I'm taking "College Algebra", but I've been told by some that it's roughly equal to Pre-Calc.
My question on this worksheet looks simple on the surface, but I never seem to get the right answer (-4/5) and it'd be nice to know why. Here it is:
Find the value of a if the line through (-1, a) and (3, -4) is parallel to y=ax.
What I've been doing is plugging (3, -4) into the equation as the x- and y-values, but that gets me the answer -4/3, which is not quite right.