Tuesday

March 3, 2015

March 3, 2015

Posted by **rany** on Sunday, March 15, 2009 at 11:00pm.

a)4x-9y=4

6x+15y=-13

im so lost!!!!!

- grade 9 math slope equations -
**Reiny**, Sunday, March 15, 2009 at 11:05pmmultiply 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 11:12pmwhy do you hav to multiply it by three though?

- grade 9 math slope equations -
**Reiny**, Sunday, March 15, 2009 at 11:14pmI 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 11:15pmthank u so much !!!!!!

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

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

**Answer this Question**

**Related Questions**

9th grade - solve and comparison: a)4x-9y+4 6x+15y=-13 im so lost!!!!!

math 10 slopes eqaution!!! HELP! please - solve and comparison: a)4x-9y+4 6x+15y...

Math 2 - You should make two selections from the list below. Which two of the ...

Math - Solve the system of two equations 2y=8 and 15y=2x-4

MATH - Please help me!!!!!!!!!!!!!!!1 Instructions a. If needed, rewrite the ...

10th grade algebra - i need help understanding linear equations. 7x-15y+9=0 ...

math,help plz - i am lost with this one. Solve the system by graphing. what is ...

grade 9 math slope equations - question: slove by comparison and check your ...

SLOPE MATH - The grade of a road is its slope given as a percent. for example, a...

math - How do you solve this problem? Find the slope-intercept equation of the ...