Homework Help: algebra

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

I need to know if I am doing this problem right when sustitution method.
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 12:08pm
You 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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