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Mathematics 19 Online
OpenStudy (anonymous):

Can anyone do this problem? http://gyazo.com/21a45399530c95a45330847690e964ab.png Been stuck on it for hours

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....

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 ----

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?

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):

\(\large \frac{-8-7}{7} \) \(\large \frac{-15}{7} \)

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 :)

ganeshie8 (ganeshie8):

np :)

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