Posted by Alison on Saturday, January 22, 2011 at 7:15pm.
In this form
Ax + By + C = 0
Slope m = -A/B
y-intercept b = -C/B
You are looking for, a negative slope
Slope m = -A/B
And, a positive y-intercept
C/B
So,
Ax + By - C = 0
Can you answer now?
I still dont get it:\
Is C the y-intercept? or B?
How do I know which one is greater or less? This is mind twisting, i dont get it
I would change it to slope intercept form
y=mx+b
y-a/b x -c/b
so for a negative coefficent of x, both a,b have to be positive, or both have to be negative. A positive y intercept means that c or b has to be negative, but not both.
Ok. That kind of makes sense.
To have a negative slope and positive
y-int, A and B must have the same sign
, C must have the opposite sign.
Therefore, the answer is C.
If the Eq was in this form:
AX + BY = C; A, B, and C must have the
same sign.
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