Addition Method? I need HELP?

Question

What is 2a+3b= -1

and 3a+5b= -2

Remember addition method. This is from a worksheet my teacher gave me and I can't find it out help.

Answer 1

   2a + 3b = -1    Multiply by 3

   3a + 5b = -2    Multiply by -2

   6a + 9b = -3

  -6a -10b = 4

Add both equations

-b = 1

So b = -1

Substitute b in one of the equations say eq 1

So 2a + 3 (-1) = -1

2a - 3 = -1

2a = -1 +3

2a = 2

a = 1

a = 1

b = -1

Answer 2

- 6a - 9b = 3

6a + 10b = - 4------ADD

b = - 1

2a - 3 = - 1

2a = 2

a = 1

a = 1 , b = - 1

Answer 3

Here's a good explanation at:

http://www.mathclues.com/MAdditionMethod...

Hope this helps you!  Please email anytime for further questions.

Answer 4

(2a+3b = -1)*-3 = -6a-9b = 3

(3a+5b = -2)*2 = 6a+10b = -4

add

b = -1

2a+3(-1)  = -1

thus a = 1

so a = 1 and b = -1

Answer 5

(-3)2a+3b=-1

(2)3a+5b=-2

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

-6a-9b=3

6a+10b=-4

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

6a and 6b canceled

1b=-1

b=-1/1

you put the b's result into the 3b and the 5b and all will be almost done,i got lazy...