santaclaus wrote:so perpendicular to this would be y=-3/5x-2 because I took the reciprocal and opposite sign for slope.
Yes. As shown in the previous reply, the slope of the given line is m = 5/3, so the slope of the perpendicular line would have to be m
_{perp} = -3/5.
santaclaus wrote:Now what does it mean when the two lines intersect at x=15?
As mentioned earlier, when lines intersect, they share a point. So plug the given x-value into the given line equation, and simplify to find the y-value for the intersection point.
santaclaus wrote:where would i insert x=15? in this equation y=-3/5-2? or the initial one ?
Um... Aren't they the equations for the same line...? Didn't we only just
re-arrange it?