SOLUTION: find an equation of the line passing through (-4,7) and parallel to the graph of 2x+y=5. write the equation in slope intercept from.

Algebra ->  Coordinate-system -> SOLUTION: find an equation of the line passing through (-4,7) and parallel to the graph of 2x+y=5. write the equation in slope intercept from.      Log On


   



Question 261772: find an equation of the line passing through (-4,7) and parallel to the graph of 2x+y=5. write the equation in slope intercept from.
Found 2 solutions by stanbon, josmiceli:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
find an equation of the line passing through (-4,7) and parallel to the graph of 2x+y=5. write the equation in slope intercept from.
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The given line has slope = -2
Every line parallal to it must have a slope of -2.
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The Form of the equation you want is y = mx + b
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You know m = -2, and y = 7 when x = -4
So, solve for "b":
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7 = -2*-4 + b
b = -1
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Equation:
y = -2x -1
==================
Cheers,
Stan H.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
First get 2x+%2B+y+=+5 in the slope intercept form
y+=+-2x+%2B+5
This is now in the form y+=+mx+%2B+b
where m is the slope, so the slope is
-2
Any line which is parallel to this line will also have
slope = -2
Now you know a point on the line you're looking for,
(-4,7), and the slope, -2. The correct formula to use
now is %28y+-+y%5B1%5D%29%2F%28x+-+x%5B1%5D%29+=+m
where
y%5B1%5D+=+7,
x%5B1%5D+=+-4,
m+=+-2
%28y+-+7%29%2F%28x+-+%28-4%29%29+=+-2
y+-+7+=+-2%2A%28x+%2B+4%29
y+-+7+=+-2x+-+8
y+=+-2x+-+1 answer
check answer
does it go through (-4,7)?
7+=+-2%2A%28-4%29+-+1
7+=+8+-+1
7+=+7
OK