Posted by **B.B.** on Sunday, April 11, 2010 at 3:16pm.

Could someone please help me with this. I am confused. Math is a weak point for me.

Solve the system of equations by graphing. Then classify the system. 9x-6y=30, 6x-9y= -30. The solution is? Consistent or inconsistent, dependent or independent?

How would I graph this?

Thanks.

- Math -
**Damon**, Sunday, April 11, 2010 at 3:26pm
9x-6y=30, 6x-9y= -30

divide everything by 3

3x - 2y = +10 multiply by 3

2x - 3y = -10 multiply by 2

9x - 6y = +30

4x - 6y = -20 now subtract

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

5 x = 50

x = 10

20 - 3y = -10

3 y = 30

y = 10

straight lines

intersection at (10,10)

slope of first = 9/6 = 1.5

slope of second = 2/3 = .6667

first hits y axis at -5 and x axis at 10/3

second hits y axis at 10/3 and x axis at -5

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