Mathematics
19 Online
OpenStudy (anonymous):
Can anyone do this problem? http://gyazo.com/21a45399530c95a45330847690e964ab.png
Been stuck on it for hours
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ganeshie8 (ganeshie8):
wats the slope of given line, \(4x-7y = 5\) ?
OpenStudy (anonymous):
4/7
ganeshie8 (ganeshie8):
perfect !
you have slope m = 4/7
you have a point = (2, -1)
set the equation in point-slope form. wats stopping u ? :)
OpenStudy (anonymous):
I always seem the get the wrong y-intercept. I don't know how
ganeshie8 (ganeshie8):
its okay :) show me wat u got....
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OpenStudy (anonymous):
y + 1 = 4/7(x - 2)
y + 1 = 4/7x - 8/7
y = 4/7x - 9/7
ganeshie8 (ganeshie8):
first two steps are correct
ganeshie8 (ganeshie8):
last step u made a small mistake
OpenStudy (anonymous):
?
ganeshie8 (ganeshie8):
y + 1 = 4/7(x - 2)
y + 1 = 4/7x - 8/7
y = 4/7x - 9/7
----
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ganeshie8 (ganeshie8):
how did u get -9/7 there ?
OpenStudy (anonymous):
-8 - 1
ganeshie8 (ganeshie8):
wat about the bottom 7 ?
why u ignoring it ?
ganeshie8 (ganeshie8):
its
-8/7 - 1
NOT -8-1
OpenStudy (anonymous):
I subtract both?
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ganeshie8 (ganeshie8):
to subtract, u need to have SAME denominator for both
ganeshie8 (ganeshie8):
\(\large \frac{-8}{7} - 1\)
ganeshie8 (ganeshie8):
\(\large \frac{-8}{7} - \frac{7}{7}\)
ganeshie8 (ganeshie8):
now that bottoms are same,
u can add/subtract the tops
ganeshie8 (ganeshie8):
\(\large \frac{-8-7}{7} \)
\(\large \frac{-15}{7} \)
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OpenStudy (anonymous):
Ohh i see now
ganeshie8 (ganeshie8):
good :)
OpenStudy (anonymous):
the final answer is y = 4/7x - 15/7 ?
ganeshie8 (ganeshie8):
\(\large \color{red}{\checkmark}\)
OpenStudy (anonymous):
Thank you so much :)
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ganeshie8 (ganeshie8):
np :)