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December 20, 2014

December 20, 2014

Posted by **Anonymous** on Thursday, October 8, 2009 at 10:56pm.

1. (12,y), (-6,9/7), m= -1/6

_____________

write an equation in slope-intercept form. (then graph the equation).

2. 18y+2x-9=0

3. 3x-4y=-8

- algebra -
**jim**, Friday, October 9, 2009 at 2:42amy=mx+c

m= -1/6

y=-(1/6)x+c

The point (-6,9/7) must be on that line: use it to find c by plugging in x and y like

9/7=-(1/6)(-6)+c

So what's c?

So now we have the equation of the line, we need the value of the point on that line where x=12. Plug in 12 instead of x in the equation and work out what y must be.

18y+2x-9=0

we need to write as y=mx+c

18y+2x-9=0

move everything but y to the RHS:

18y=-2x+9

y=(-2/18)x+9/18

which you can simplify a bit.

You can do the other yourself the same way.

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