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December 21, 2014

December 21, 2014

Posted by **Anonymous** on Saturday, January 5, 2013 at 3:24pm.

-7x+8y=-5

- solving equations by sibstitution -
**San**, Saturday, January 5, 2013 at 3:46pmmultiply the top by positive 8 and multiply the bottom by negative 6. then cancel out the y's and solve for x. plug x back into anyone and solve for y.

- solving equations by sibstitution -
**Steve**, Saturday, January 5, 2013 at 3:56pmhmm. sounds like elimination to me.

For substitution, pick either equation and solve for x (or y):

-2x+6y=6

6y = 2x+6

y = x/3 + 1

Now substitute that into the other equation:

-7x+8y = -5

-7x + 8(x/3 + 1) = -5

-7x + 8x/3 + 8 = -5

-13x/3 = -13

x = 3

so, y = x/3+1 = 2

be sure to plug (3,2) into the original equations to make sure you (or I!) didn't make a mistake.

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