Posted by rany on .
solve and comparison:
a)4x9y=4
6x+15y=13
im so lost!!!!!

grade 9 math slope equations 
Reiny,
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,
why do you hav to multiply it by three though?

grade 9 math slope equations 
Reiny,
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,
thank u so much !!!!!!

grade 9 math slope equations 
salsun,
i'm so dead!

grade 9 math slope equations 
Anonymous,
Type the ordered pair that is the solution to these equations.3x  2y = 8 2x + 5y = 1.