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April 23, 2014

April 23, 2014

Posted by **Jocelyn** on Tuesday, May 24, 2011 at 9:07pm.

4x+3y=-6

- Algebra -
**Anonymous**, Tuesday, May 24, 2011 at 9:42pmx - 3y = -9

-3y = -9 - x Multiply with -1

3y = 9 + x

4x + 3y= -6

4x + 9 + x = -6

5x + 9 = -6

5x = -6 - 9

5x = -15 Divide with 5

x= -15/5

x= -3

3y=9 + x

3y = 9 +(-3)

3y = 9 - 3

3y = 6 Divide with 3

y = 6/3

y= 2

Solution:

x = -3

y = 2

- Algebra -
**MathMate**, Tuesday, May 24, 2011 at 9:56pmIf we note that there is a +3y and a -3y in each of the equations, we simply add the two equations to get:

5x=-15, or x=-3

Substitute x=-3 in either one of the equations to get

-3-3y=-9

-3y=-6

y=2

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