Wednesday

July 23, 2014

July 23, 2014

Posted by **Holly** on Saturday, March 13, 2010 at 6:39pm.

1)

5x+7y=43

-4x+y=25

2)9x-9y=36

7y-3x=-14

- math -
**Miguel Santos**, Saturday, March 13, 2010 at 7:03pmFor 1), just muttiply the bottom one by -7 throughout to get 28x+-7y=-175. 7 and -7 add to 0, so you have gotten rid of the y's. 31x=-132 divide both sides to get what your x is and then use that x to go back and find y.

For 2) the best first move to make is multiply through by 3 on the bottom because then you get 21y + -9x = -42. Positive and negative 9 x add up to zero. All you have to deal with now are the y's. 12 y= -6 divide both sides and now you have a y with which to find x.

- math -
**Holly**, Saturday, March 13, 2010 at 7:15pmwould the answer to number 1 be

(-4.26,1.52)?

would the answer to number 2 be

(-0.5,-6.5)?

**Related Questions**

math - can someone please help me with this elimination methods problem? 0.05x+0...

math - Can someone help me solve the following....using elimination methods 1) ...

MAT 101 - Solve for X and Y in the following problems using either substitution ...

Lynn - What are some pros and cons of using each of the following methods when ...

Math - Solve by eliminnation methods 2x-4y=5 2x-4y=6 solve the system by ...

algebra - I just need a quick check before I hand in my work if you would......

Math - Could someone give me an example of a linear eqution using elimination to...

math - 0.3x-0.2y=4 0.5x+0.3y=-7/17 Can anyone Please help me solve using the ...

Math - Please help! x-2y+z=7 2x+y-z=0 3x+2y-2z=-2 a. Solve the above system of ...

math 3 - Solve the following system using the elimination method: 10x - 6y = -...