Posted by Lilly on Monday, November 30, 2009 at 6:04pm.
Write an equation in a standard form of the line that passes through (3,1) and has a yintercept of2 .
My book does not have problems like this so PLEASE help me!!!!!!!!!

Math  Reiny, Monday, November 30, 2009 at 6:31pm
given the yintercept of 2 implies you have a second point (0,2)
so the slope is (21)/(03) = 3/3 = 1
You now have the slope and the yintercept.
Can you take it from here ?

Math  Lilly, Monday, November 30, 2009 at 6:33pm
x+y=2 ?

Math  Reiny, Monday, November 30, 2009 at 6:38pm
very close.
from the information so far we would have
y = x  2
or x  y = 2
You can always check if your equation is correct by subbing in the given points.
notice for your equation and using (3,1)
we would get
3+1 = 2 ??

Math  Lilly, Monday, November 30, 2009 at 6:40pm
How would you get a positive 2 though?

Math  Reiny, Monday, November 30, 2009 at 6:44pm
I had better put my glasses on.
I read your equation as x+y = 2, didn't notice the  sign in front.
Good observation!

Math  Lilly, Monday, November 30, 2009 at 6:46pm
thats ok, so would it be 4 ?
I now got 3x+y=2

Math  Reiny, Monday, November 30, 2009 at 7:30pm
no, I thought you understood when I told you it was xy = 2.
Let's try it again:
2 points
(3,1) and (0,2)
slope = (21)/(03) = 1
then using y = mx + b
we have y = (1)x  2
or x + y = 2
or
x  y = 2

Math  Anonymous, Monday, November 30, 2009 at 8:01pm
ok thanks, sorry!
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