4. (-7) = (-2)(-2) + b

(-7) = (4) + b

-11 = b

y = -2x -11

I don't see anything wrong with this(Smirk) Do you?

- Aug 11th 2009, 12:56 PMbobbyboy1111My teacher says this linear equation is wrong, I think she is wrong.
4. (-7) = (-2)(-2) + b

(-7) = (4) + b

-11 = b

y = -2x -11

I don't see anything wrong with this(Smirk) Do you? - Aug 11th 2009, 12:58 PMMatt Westwood
Looks okay to me. What does she think it ought to be? Maybe it's the bit that leads up to this what's wrong.

- Aug 11th 2009, 04:58 PMHallsofIvy
What was the

**question**? The only thing "wrong" with that is that it doesn' maqke any sense at all! Why should "b" have anything at all to do with x and y? What are you trying to do?

Frankly, it looks to me like you have a very**good**teacher who is concerned about your tendency to do algebraic operations without thinking about what you are doing. - Aug 11th 2009, 11:28 PMbobbyboy1111
- Aug 12th 2009, 01:59 AMStroodle
- Aug 12th 2009, 02:05 AMpacman
The problem may be have this given values, slope = m = -2; then the line passes through points (-2,-7). find the equation of the line.

y = mx + b, where m = -2 and points (-2,-7), substituting

(-7) = (-2)(-2) + b

(-7) = (4) + b

-11 = b

y = -2x -11. This is the slope-intercept form and seems alright.

What if you have interchanged the point (-7,-2) to (-2,-7)?

Or you have the wrong form of the equation of the line . . . .(Surprised) - Aug 12th 2009, 02:15 AMmr fantastic
This thread has required constant moderation from the go get. It has become too troublesome to keep opened.

Thread closed.