anonymous
  • anonymous
Help please. Simple question. If the line passes through the origin, what is the value of k?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1442327857975:dw|
anonymous
  • anonymous
Slope is |dw:1442327944302:dw|
anonymous
  • anonymous
Can you simply solve this by doing |dw:1442328022429:dw|

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anonymous
  • anonymous
does that 0 matter is what im asking
anonymous
  • anonymous
cuz the y intercept is b which is 0
anonymous
  • anonymous
Ypu as it passes throught the origin In the form ax+by+c=0 c will be 0
anonymous
  • anonymous
ok so can you answer my question
anonymous
  • anonymous
phi
  • phi
adding 0 does not change the value (so people don't write it) the equation is y = (-7/4)x you could write y = (-7/4)x +0 but the +0 does not change the equation so why bother? to find k you put in x=14 and you get y= -7/4 * 14 = -49/2 = -24.5
anonymous
  • anonymous
but in other cases if it wasn't a 0 would it be necessary?
phi
  • phi
if you were given the equation y= (-7/4) x and were asked what is the y-intercept you would want to match up your equation with y= mx + b we can match -7/4 with m, but there is nothing to match b we can "fix" that by writing y= (-7/4) x + 0 (+0 does not change the equation) and now we can match b with 0 that is an example of why you might write down +0 but usually, we don't bother
phi
  • phi
if the y intercept is not 0, then you definitely would have to write it down
anonymous
  • anonymous
okay got it im just gonna always include the 0 to be on the safe side.
phi
  • phi
I would just add it "mentally" (i.e. not write it down) you also have the same thing with multiplying and "1" for example y = x+2 if we match that with y= mx + b we see b is 2 but what is m? We write in y= 1*x + 2 now it is clear that m is 1 but usually we don't write y= 1x+2 instead we write y= x+2
anonymous
  • anonymous
ohhh okay got it thanks phi!

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