Thursday

April 24, 2014

April 24, 2014

Posted by **Anonymous** on Tuesday, February 21, 2012 at 3:15pm.

-5x-9y=19

8x-7y=-9

- algebra -
**Reiny**, Tuesday, February 21, 2012 at 5:12pm1st times 8 ----> -40x - 72y = 152

2nd times 5 ----> 40x - 35y = -45

add them

- 107y = 107

y = -1

back into 1st:

-5x + 9 = 19

-5x = 10

x = -2

- algebra -
**MathGuru**, Tuesday, February 21, 2012 at 5:22pmWe can solve x or y, so I'll pick y. Let's get rid of x by multiplying the top equation by 8 and the bottom equation by 5:

8(-5x - 9y = 19)

5(8x - 7y = -9)

-40x - 72y = 152

40x - 35y = -45

---------------

.... -107y = 107

.........y = -1

I'll let you take it from here to figure out the value of x. Check solutions with the original equations. It always helps to check your work!

I hope this will help get you started.

**Related Questions**

Algebra 116 - I need help with these algebra problems please. 1.Solve by using ...

Algebra 1 - solve by the substitution method. 5x+9y=53 x=47-7y

mATH, ALGEBRA - i need help solving the system by addition. 5x-7y=5 x+3y=1 this ...

algebra - 5x-9y=113x+7y=19.......plz help serious..........

math - solve using multiplication method: 8x-9y=-15 -4x=19+y

substitution method - solve using the substitution method 8x -9y= -95 5x+64=y ...

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

Algebra - Solving system of linear equations by using the apropiate method name ...

math - solve the following system of equations 8x+9y= -19 -3x+7y= -24 x= y=

math - solve the following system of equation 8x+9y=-19 -3x+7y=-24