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January 30, 2015

January 30, 2015

Posted by **Daisy** on Monday, January 25, 2010 at 7:51pm.

1) y= 3x - 8

y= 4-x

2) 2x + 7y = 3

x=1- 4y

3) x = 2y

4x + 2y = 15

Any help. I know i should probably know this by now. i started mid term :/

- algebra -
**PsyDAG**, Tuesday, January 26, 2010 at 10:55am3. Substitute 2y for x in the second equation.

4(2y) + 2y = 15

Solve for y. Put that value in the first equation to solve for x. Check by putting both values in the second equation.

You can substitute either x or y value from one equation to the other to solve.

Use these steps in doing the first two problems. I hope this helps.

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