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If you have a line perp. to another line, then its slope will be the negative inverse. So if m=2/3, then the other m will equal: m=-3/2.
If a line is parallel, then both lines have the same slope (m-value).
and if the m's are equal the lines are either parallel or on top of each other
If the m's have the same slope and same y-intercept (b-value) then they're on top of one another. :-)
I don't think she wants to try working on this problem, so I'm out.
no.. i just don't understand it at all, i don't know what m/b/x/y are i have absolutely no idea what i'm doing, or how to even attempt to solve this because i'm supposed to be "teaching myself" and the books aren't helping. and i feel like an idiot.
on the x-y grid you know that y=mx+b is the equation of a straight line,
m is the slope (ie a slope of 0 is horizontal
b in the place where the lines cuts the y-axis