anonymous
  • anonymous
please help
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
a.) y = - 2x - 2 b.)y = - 3x - 2 c.)y = - 2x - 4 d.)y = - 3x - 4
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anonymous
  • anonymous
looks like a slope of -3 and y intercept of -4
anonymous
  • anonymous
i am not able to see the points clearly............can u just repost it by zooming

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anonymous
  • anonymous
yes hang on.
anonymous
  • anonymous
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anonymous
  • anonymous
well come to think of it..i cant see the points either
anonymous
  • anonymous
thanks @binarymimic, i cant even see the points on the original picture on my screen
whpalmer4
  • whpalmer4
Look at the graph to find points where you can see the exact values. (-2,2) and (-1,-1) are two such points. Difference of 1 in the x values gives a difference of -3 in the y values, so the slope is -3 (y goes down as x goes up). The y intercept is just the value of y where the line crosses the y axis, and that is -4. the formula for the line in slope intercept form is y = mx + b where m is slope and b is y-intercept, so y = -3x -4, choice d).
anonymous
  • anonymous
ya...........for sure its d firstly the y -intercept is -4 and secondly the graph passes through (-2,2)
anonymous
  • anonymous
can you confirm my answer on my next one?
anonymous
  • anonymous
What is the slope of a line perpendicular to the line in this graph? i got -1/3
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anonymous
  • anonymous
i think you forgot to take the reciprocal of it
anonymous
  • anonymous
ohh so it would just be 1/3 instead of -1/3?
whpalmer4
  • whpalmer4
Slope of a perpendicular line will be -1/m. m in this graph is 1/3 (3 units to the right for x to make 1 unit up for y), so the correct answer would be -1/(1/3) or -3. you want the line to be going steeply down from left to right
whpalmer4
  • whpalmer4
move 1 unit right in x, down 3 in y
anonymous
  • anonymous
the reciprocal of a # is what you get when you take 1 divided by the #
anonymous
  • anonymous
ohhh so -3..i see. sorry! lol
anonymous
  • anonymous
yeah
whpalmer4
  • whpalmer4
always good to mark off a pair of points with the new equation to make sure the line is what you expect!
whpalmer4
  • whpalmer4
so easy to make arithmetic or sign errors...
anonymous
  • anonymous
ok i have one more question about graphing..do you guys want me to post in as a new question or just post it here? aand thankyou so much! and yes, I tend to make sign errors a lot lol
anonymous
  • anonymous
i think i have the answer to my question..just want to get a second thought on it
whpalmer4
  • whpalmer4
fire away
anonymous
  • anonymous
Given the point (-4, 2) and a slope of -1
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anonymous
  • anonymous
thats the answer im thinking...
anonymous
  • anonymous
did you draw that?
anonymous
  • anonymous
heres the other ones that i had to choose from
anonymous
  • anonymous
noo. too bad i still cant see the points..idk why they would put it soo small
whpalmer4
  • whpalmer4
If the slope is -1, then it should move one point down and one to the right, like in aaa.gif
anonymous
  • anonymous
look carefully at the choices. which one has (-4, 2) as a point, and a slope of -1
anonymous
  • anonymous
is it safe to choose ccc.gif or no?
whpalmer4
  • whpalmer4
They've all got (-4,2) as a point. only aaa.gif has a slope of -1
anonymous
  • anonymous
@whpalmer4 that makes more sense
whpalmer4
  • whpalmer4
ccc.gif has a slope of -3/2
anonymous
  • anonymous
idk whati was thinking lol. sorry :P
whpalmer4
  • whpalmer4
it's late, unless you're in Asia :-)
anonymous
  • anonymous
haha. can you help me with one more? thats is all. ill open it in a new question thoughif you are willing to
whpalmer4
  • whpalmer4
okay

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