Posted by rany on Sunday, March 15, 2009 at 11:00pm.
solve and comparison:
a)4x9y=4
6x+15y=13
im so lost!!!!!

grade 9 math slope equations  Reiny, Sunday, March 15, 2009 at 11:05pm
multiply the first by 3 to get
12x  27y = 12 or 12x = 27y + 12
multiply the second by 2 to get
12x + 30y = 13 or 12x = 30y  13
now "compare" the 12x of the first part with the 12x of the second part to get
27y + 12 = 30y  13
etc.
"elimination" would be the more practical way of doing this one.
just subtract my two altered equations

grade 9 math slope equations  rany, Sunday, March 15, 2009 at 11:12pm
why do you hav to multiply it by three though?

grade 9 math slope equations  Reiny, Sunday, March 15, 2009 at 11:14pm
I wanted the x's to have the same coefficient.
you had
4x .... and
6x ....
think of finding a "common denominator"
and remember, what I do to one side of any equation, I must do to the other side.

grade 9 math slope equations  rany, Sunday, March 15, 2009 at 11:15pm
thank u so much !!!!!!

grade 9 math slope equations  salsun, Thursday, April 28, 2011 at 6:40am
i'm so dead!

grade 9 math slope equations  Anonymous, Wednesday, January 25, 2012 at 11:30am
Type the ordered pair that is the solution to these equations.3x  2y = 8 2x + 5y = 1.
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