Posted by **jim** on Thursday, March 13, 2008 at 11:09pm.

show how to solve these problems:

1. 6x - y = -4

2x + 2y = 15 answer:x = 1/2

y = 7

2. x +y = 1 x = -1/3

2x - y = -2 y = 4/3

3. x - y = 3 x = 5/2

6x + 4y = 13 y = - 1/2

I just need to know how to solve these problems. Please show me how it is done.

- algebra -
**drwls**, Thursday, March 13, 2008 at 11:22pm
Do them all the same way: either by combining equations in a way that cancels out one unknown, or by substitution.

Here is how problem #3 can be solved:

Substitute y + 3 for x in the second equation,

6(y+3)+ 4y = 13

10y + 18 = 13

10 y = -5

y = -1/2

x = y+3 = 5/2

Now you try the others.

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