anonymous
  • anonymous
Which of the following is a correct equation for the line passing through the point (-2,1) and having slope m = 1/2? Check all that apply.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
start with the point - slope formula \[y-1=\frac{1}{2}(x+2)\] then see how many are of that form
anonymous
  • anonymous
the answer is c

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More answers

anonymous
  • anonymous
actually the answer is not C
anonymous
  • anonymous
question asks Check all that apply.
anonymous
  • anonymous
oh yeah wait
anonymous
  • anonymous
indicating that you should look for more than one
anonymous
  • anonymous
how do I know how many are of y-1=1/2(x+2)?
anonymous
  • anonymous
also indicating that blurting out an answer with no explanation is not that helpful
anonymous
  • anonymous
well that one is for sure, so A is one choice
anonymous
  • anonymous
so it is b and c
anonymous
  • anonymous
no a is wrong
anonymous
  • anonymous
you substitute -2,1 in to the answer choices if they make sense it is right, hence it is bc
anonymous
  • anonymous
@ali1029 if you get an answer here like you did above, with no explanation, it may easily be wrong and you should check it yourself
anonymous
  • anonymous
im sorry if i said something right because i was in algebra last year in 7th grade.
anonymous
  • anonymous
something wrong*
anonymous
  • anonymous
i can show you how to do it if you like
anonymous
  • anonymous
yes please. I would like to know what the correct answers are but with an explanation so I know how to figure out future problems, if you dont mind :) @satellite73
anonymous
  • anonymous
ok first off, if you look at your answers you will see three forms for a line the "point - slope" from which looks like \(y-y_1=m(x-x_1)\) do you see that one?
anonymous
  • anonymous
is that A?
anonymous
  • anonymous
yes then there are two other forms standard form \(ax+by=c\) and "slope intercept" form \(y=mx+b\) do you see those?
anonymous
  • anonymous
for the first one, B and for the second one, C?
anonymous
  • anonymous
yes, the first one is B, but the second one is both C and D
anonymous
  • anonymous
D is incorrect
anonymous
  • anonymous
so the answer would be all of them?
anonymous
  • anonymous
so now we have to figure out which ones of these fit our equation
anonymous
  • anonymous
oh okay
anonymous
  • anonymous
do you know how i got this \[y-1=\frac{1}{2}(x+2)\]?
anonymous
  • anonymous
correct? ._.
anonymous
  • anonymous
i am just asking if you know how i got that equation
anonymous
  • anonymous
you used the point slope formula right?
anonymous
  • anonymous
exactly
anonymous
  • anonymous
you can see that it is A, so A is one correct answer
anonymous
  • anonymous
would C and D be correct since they have a point and a slope?
anonymous
  • anonymous
now lets take \[y-1=\frac{1}{2}(x+2)\] and write it in standard form multply both sides by \(2\) and ge t \[2y-2=x+2\] subtract \(2y\) and get \[x-2y+2=-2\] and finallysubtract \(2\) to get \[x-2y=-4\]
anonymous
  • anonymous
so B is correct also btw don't forget that C and D are not "point slope" they are "slope intercept"
anonymous
  • anonymous
now we take \[y-1=\frac{1}{2}(x+2)\] and write it in slope - intercept form
anonymous
  • anonymous
multiply out on the right and get \[y-1=\frac{1}{2}x+1\] then add \(1\) and get \[y=\frac{1}{2}x+2\]
anonymous
  • anonymous
so you see that C is correct also
anonymous
  • anonymous
that means D cannot be correct, because there is only one way to write a line is "slope - intercept" form
anonymous
  • anonymous
i completely get that now! thank you!! @satellite73
melodey1
  • melodey1
its abc, i just did this problem

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