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anonymous

  • one year ago

Help please. Simple question. If the line passes through the origin, what is the value of k?

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  1. anonymous
    • one year ago
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    |dw:1442327857975:dw|

  2. anonymous
    • one year ago
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    Slope is |dw:1442327944302:dw|

  3. anonymous
    • one year ago
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    Can you simply solve this by doing |dw:1442328022429:dw|

  4. anonymous
    • one year ago
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    does that 0 matter is what im asking

  5. anonymous
    • one year ago
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    cuz the y intercept is b which is 0

  6. anonymous
    • one year ago
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    Ypu as it passes throught the origin In the form ax+by+c=0 c will be 0

  7. anonymous
    • one year ago
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    ok so can you answer my question

  8. anonymous
    • one year ago
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    @phi

  9. phi
    • one year ago
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    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

  10. anonymous
    • one year ago
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    but in other cases if it wasn't a 0 would it be necessary?

  11. phi
    • one year ago
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    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

  12. phi
    • one year ago
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    if the y intercept is not 0, then you definitely would have to write it down

  13. anonymous
    • one year ago
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    okay got it im just gonna always include the 0 to be on the safe side.

  14. phi
    • one year ago
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    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

  15. anonymous
    • one year ago
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    ohhh okay got it thanks phi!

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