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March 5, 2015

March 5, 2015

Posted by **Donna** on Tuesday, February 15, 2011 at 5:34pm.

y+2x=3

y+2x=-4

y+2x=3 -1(y+2x=3)-y-2x=-4

now add the two equation

y-2x=3

-y-2x-4

the answer would be -4y=7

then divided -4=7 answer 1.75

I no that there is more to this answer I am just stuck and not sure if this is right are not.

- algebra -
**PsyDAG**, Wednesday, February 16, 2011 at 12:08pmYou are not doing substitution.

y = 3 - 2x

y + 2x = -4

Substitute 3 - 2x for y in second equation and solve for x. Insert that value into the first equation and solve for y. Check by inserting both values into the second equation.

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