anonymous
  • anonymous
the question is "y= -2x + 1" and it needs to be graphed. Do I divied -2x by -2? Also does that make the y intercept 1? Im just checking my answer :)
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
the x intercept is certainly 1, because \((0,1)\) is on the graph
anonymous
  • anonymous
and no, you do not divide by anything pick an x, find the y, plot the point for example, if \(x=2\) then \(y=-2\times 2+1=-3\) so \((2,-3)\) is on the graph
anonymous
  • anonymous
so can you walk me through the problem how it should be done so I know for next time?

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anonymous
  • anonymous
i thought i just did, but we can go slower if you like you know the y intercept is 1, because you said it, so \((0,1)\) is on the graph |dw:1440292521307:dw|
anonymous
  • anonymous
now the slope is \(-2\) which means for every increase of 1 in x, the y values decreases by 2
anonymous
  • anonymous
Oh, so do I just plot -2 on the x-axis?
anonymous
  • anonymous
but we can do ahead and plot a few points then connect the dots
anonymous
  • anonymous
no you do not
anonymous
  • anonymous
lets put \(x=1\) and see what \(y\) is
anonymous
  • anonymous
if \(x=1\) then \(y=-2\times 1+1=-2+1=-1\) so the point \((1,-1)\) is on the graph
anonymous
  • anonymous
|dw:1440292666244:dw|
anonymous
  • anonymous
maybe now pick \(x=2\) then if \(x=2\) you have \[y=-2\times 2+1=-4+1=-3\] so now we know \((2,-3)\) is on the graph
anonymous
  • anonymous
|dw:1440292749283:dw|
anonymous
  • anonymous
once you have a few points plotted, they should line up nicely and you connect the dots to get your line
anonymous
  • anonymous
|dw:1440292799179:dw|
anonymous
  • anonymous
ok thanks :)

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