Please help. Passes through (-1,4) perpendicular to 3x+2y=9
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OpenStudy (itz_sid):
Okay so you should start off by putting that equation into slope-intercept form. It will be easier to work with that way.
OpenStudy (jiteshmeghwal9):
Question is incomplete
OpenStudy (shadowlegendx):
You can assume its asking for a line with those parameters
OpenStudy (shadowlegendx):
As @iTz_Sid said, we must put the equation into slope-intercept form.
\[3x+2y=9 \]
Subtract 3x from both sides
\[2y = -3x + 9\]
Divide the entire equation by 2
\[y = \frac{ -3}{ 2 }x + \frac{ 9 }{ 2 }\]
OpenStudy (montsechamorro):
Oh! Let me do the problem really quick and see if we get the same answer
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OpenStudy (shadowlegendx):
We need the slope perpendicular to -3/2x, so we take the opposite reciprocal.
Switch the numerator(-3) with the denominator(2). We get 2/-3. Then we change the negative sign to a positive sign.
The slope 2/3 is perpendicular to -3/2
OpenStudy (shadowlegendx):
Ok, I won't write any further steps :P
OpenStudy (montsechamorro):
Okay so I got y= 2/3x+4/3
OpenStudy (shadowlegendx):
How did you get 4/3
OpenStudy (shadowlegendx):
Oh as your final answer?
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OpenStudy (montsechamorro):
Yes
OpenStudy (jiteshmeghwal9):
If u have an equation of format ax+by+c=0. Then a line perpendicular to this line shall be ax-by+c' where c' is another constant
OpenStudy (jiteshmeghwal9):
3x+2y-9=0
Perpendicular line is
3x-2y+c'=0
Replace x &y by -1 & 4 respectively to get c'
OpenStudy (jiteshmeghwal9):
Thus form the final equation
OpenStudy (montsechamorro):
So am I wrong with y=2/3x+4/3
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OpenStudy (shadowlegendx):
Yes
OpenStudy (montsechamorro):
Alright so I used y-4=2/3(x-4)
OpenStudy (shadowlegendx):
Why x-4
OpenStudy (montsechamorro):
I used the y-y1=M(x-x1) formula
OpenStudy (montsechamorro):
oh I see! I plugged in 4
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OpenStudy (shadowlegendx):
yeah c;
OpenStudy (montsechamorro):
So y=2/3x+21/12
OpenStudy (shadowlegendx):
woah
OpenStudy (shadowlegendx):
no
OpenStudy (shadowlegendx):
What did you start with?
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OpenStudy (montsechamorro):
Y-4= 2/3(x+1)
OpenStudy (shadowlegendx):
Then what did you do next
OpenStudy (montsechamorro):
distribute 2/3
Y-4= 2/3x+ 2/3
OpenStudy (shadowlegendx):
Ok, then what next
OpenStudy (montsechamorro):
ADD 4 to 2/3
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OpenStudy (montsechamorro):
oh! I found my mistake. So my answer was y= 2/3x+ 14/3