Bphillips99
  • Bphillips99
PLEASE HELP ASAP AB and BC form a right angle at point B. If A = (-3, -1) and B = (4, 4), what is the equation of BC? x + 3y = 16 2x + y = 12 -7x − 5y = -48 7x − 5y = 48
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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DanJS
  • DanJS
AB and BC are the components of the slope of the hypotenuse
DanJS
  • DanJS
graph all they give you
Bphillips99
  • Bphillips99
|dw:1449189079320:dw|

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DanJS
  • DanJS
yeah, then they tell you there is a right angle at B
Bphillips99
  • Bphillips99
i have no clue what to do from here...
DanJS
  • DanJS
|dw:1449189247573:dw|
DanJS
  • DanJS
they say there is a right angle at B , so point C is on that dotted line
Bphillips99
  • Bphillips99
thanks but idk.. i don't get it.
DanJS
  • DanJS
well, you can calculate the slope of AB then recall, the slope o fa perpendicular line (BC) is th enegative recipricle
Bphillips99
  • Bphillips99
3/4
DanJS
  • DanJS
|dw:1449189424915:dw|
DanJS
  • DanJS
slope AB = (4 + 1) / (4 + 3) = 5 / 7 so Slope AC = - 7 / 5
DanJS
  • DanJS
and the point B is on the line, so use slope -7/5 and point B to make the equation
DanJS
  • DanJS
y - 4 = (-7/5)*(x - 4) rearrange to the other form they want
DanJS
  • DanJS
y - 4 = (-7/5)x + (28/5) 5y - 20 = -7x + 28 5y + 7x = 48
DanJS
  • DanJS
, the answer has all negatives instead (-1) times everything

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