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December 18, 2014

December 18, 2014

Posted by **Tasha** on Tuesday, May 20, 2008 at 12:09pm.

3y - x = 5

Please help me out.

- Substitution method to solve system of equations -
**Reiny**, Tuesday, May 20, 2008 at 12:24pmchange to first equation to

y = 2x - 5

now sub that into the second one

3y - x = 5

3(2x-5) - x = 5

6x - 15 - x = 5

5x = 20

x = 4

now put that value of x into y = 2x - 5

y = 2(4) - 5

= 8-5

= 3

check in

#1 : 3 - 8 = -5 checks!

#2 : 9 - 4 = 5 checks!

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